Addition And Subtraction In Word Problems - 1st Grade Math

1. Amir has 6 red apples and 8 green apples. How many apples does Amir have altogether?
   Answer: 14 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a putting together problem with total unknown. We combine two parts to find the whole. The story tells us Amir has 6 red apples and 8 green apples. Choice B is correct because to find how many apples Amir has altogether, we add: 6 + 8 = 14. We can represent this as an equation with unknown: 6 + 8 = ?. Choice D is a common error where students add incorrectly, perhaps doubling one number (8 + 8 = 16); this happens because calculation facts may not be automatic yet. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I have 6 red and 8 green, need the total, so I add'); practice all unknown positions; connect to familiar experiences.
2. Solve the story. Keisha has 5 red balloons and 7 blue balloons. How many balloons does Keisha have altogether?
   Answer: 12 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a putting together problem with total unknown. We combine two amounts to find the whole. The story tells us Keisha has 5 red balloons and 7 blue balloons. Choice C is correct because to find how many balloons altogether, we add: 5 + 7 = 12. We can represent this as 5 + 7 = ?. Choice B is a common error where students add incorrectly, like 5 + 8 = 13, or perhaps subtract 7 - 5 = 2 for A. This happens because calculation facts may not be automatic yet. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('altogether' suggests addition); model thinking aloud ('5 red and 7 blue, total? I add them'); practice all unknown positions; connect to familiar experiences.
3. Amir has 11 toy cars. He gives away some cars. He has 8 cars left. How many cars did Amir give away? $11 - ? = 8$
   Answer: 3 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with change unknown. We start with one amount, end with another, and find what was taken away. The story tells us Amir has 11 toy cars, gives away some, and has 8 left. Choice A is correct because to find how many cars Amir gave away, we subtract: 11 - 8 = 3. We can represent this as 11 - ? = 8. Choice D is a common error where students calculate incorrectly, such as subtracting in the wrong order like 8 - 4 = 4 or miscounting. This happens because change and start unknown require reversing the typical operation. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I started with 11, ended with 8, need to find what was taken, so I subtract'); practice all unknown positions; connect to familiar experiences.
4. Read the story. Chen has 6 pencils. He gets some more. Now he has 10 pencils. How many pencils did Chen get?
   Answer: 4 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is an adding to problem with change unknown. We start with one amount, end with another, and find what was added. The story tells us Chen has 6 pencils and gets some more, now having 10. Choice C is correct because to find how many pencils Chen got, we subtract: 10 - 6 = 4, or think 6 + ? = 10. We can represent this as 6 + ? = 10. Choice A is a common error where students add instead of finding the difference, getting 6 + 10 = 16. This happens because change unknown requires reversing the typical operation. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('some more' with total given suggests finding the addition amount); model thinking aloud ('Started with 6, now 10, so how many added? I can count up or subtract'); practice all unknown positions; connect to familiar experiences.
5. Keisha has 15 points in a game. She scores 4 more points. How many points does Keisha have now? $15 + 4 = ?$
   Answer: 19 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is an adding to problem with result unknown. We start with one amount and add more to find the total. The story tells us Keisha has 15 points and scores 4 more. Choice B is correct because to find how many points Keisha has now, we add: 15 + 4 = 19. We can represent this as 15 + 4 = ?. Choice A is a common error where students use the wrong operation, subtracting instead of adding: 15 - 4 = 11. This happens because choosing the operation from word problem context is challenging. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I started with 15, added 4, need the total, so I add'); practice all unknown positions; connect to familiar experiences.
6. Keisha has some balloons. She gives away 5 balloons. Now she has 9 balloons. How many balloons did Keisha have at first?
   Answer: 14 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with start unknown. We subtract from an unknown starting amount to reach a result, and find the start. The story tells us Keisha has some balloons, gives away 5, and now has 9. Choice B is correct because to find how many balloons Keisha had at first, we add back: 9 + 5 = 14. We can represent this as an equation with unknown: ? - 5 = 9. Choice A is a common error where students subtract instead of adding back (9 - 5 = 4); this happens because start unknown problems require reversing the typical operation. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('Ended with 9 after giving away 5, need start, so I add back'); practice all unknown positions; connect to familiar experiences.
7. Emma has 14 crayons. She puts some crayons in a box and keeps 6 crayons on her desk. Later, she takes 3 crayons out of the box. How many crayons are in the box now?
   Answer: $5$ crayons in the box When you see a word problem with multiple steps, it helps to work through each action one at a time and keep track of what's happening to the crayons. Let's start with what Emma has: 14 crayons total. She keeps 6 crayons on her desk, which means the rest must go in the box. To find how many go in the box, you subtract: $14 - 6 = 8$ crayons in the box. Next, Emma takes 3 crayons out of the box. Now you need to subtract those 3 from the 8 that were in the box: $8 - 3 = 5$ crayons remaining in the box. Looking at the wrong answers: Choice A (17) doesn't make sense because Emma only started with 14 crayons total, so she can't have 17 in just the box. Choice B (8) is the number that was in the box before Emma took any out - this ignores the final step. Choice C (11) might come from incorrectly adding 14 and 3, but that doesn't match what's happening in the problem. The correct answer is D: 5 crayons are in the box now. For multi-step word problems like this, always read carefully and work through each action in order. Don't rush to the end - take it one step at a time, and make sure each step makes sense before moving to the next one.
8. Yuki has 13 shells. Carlos has 9 shells. How many more shells does Yuki have than Carlos? $13 - 9 = ?$
   Answer: 4 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a comparing problem with difference unknown. We compare two amounts to find how many more or fewer. The story tells us Yuki has 13 shells and Carlos has 9 shells. Choice B is correct because to find how many more shells Yuki has than Carlos, we subtract: $13 - 9 = 4$. We can represent this as $13 - 9 = ?$. Choice A is a common error where students find the total instead of the difference, adding: $13 + 9 = 22$. This happens because in compare problems, students may not recognize 'how many more' as subtraction. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('Yuki has 13, Carlos 9, to find how many more, I subtract'); practice all unknown positions; connect to familiar experiences.
9. Yuki has some shells. She finds 5 more shells. Now she has 14 shells. How many shells did Yuki have at the start?
   Answer: 9 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is an adding to problem with start unknown. We add an amount to an unknown start to reach a total, and find the start. The story tells us Yuki has some shells, finds 5 more, now has 14. Choice A is correct because to find how many shells Yuki had at the start, we subtract: 14 - 5 = 9. We can represent this as an equation with unknown: ? + 5 = 14. Choice D is a common error where students might add instead: 14 + 5 = 19, using the wrong operation for the unknown position. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('some' and 'more' with total given means start unknown); model thinking aloud ('Ended with 14 after adding 5, to find start, I subtract'); practice all unknown positions; connect to familiar experiences.
10. Read the story. Maya has 8 apples. She eats some apples. Now she has 3 apples. How many apples did Maya eat?
    Answer: 5 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with change unknown. We start with one amount, end with another, and find what was taken away. The story tells us Maya has 8 apples, eats some, and now has 3. Choice B is correct because to find how many apples Maya ate, we subtract: 8 - 3 = 5, or 8 - ? = 3. We can represent this as 8 - ? = 3. Choice A is a common error where students add instead, getting 8 + 3 = 11. This happens because change unknown requires reversing the typical operation. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('eats some' with remainder given suggests finding the subtracted amount); model thinking aloud ('Started with 8, now 3 left, so how many eaten? I subtract'); practice all unknown positions; connect to familiar experiences.
11. Maya has 18 stickers. 11 stickers are stars. How many stickers are not stars?
    Answer: 7 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking apart problem with one addend unknown. We start with a total and one part, and find the other part. The story tells us Maya has 18 stickers and 11 are stars. Choice A is correct because to find how many stickers are not stars, we subtract: 18 - 11 = 7. We can represent this as an equation with unknown: 18 - 11 = ?. Choice B is a common error where students add instead of subtracting (18 + 11 = 29); this happens because choosing the operation from word problem context is challenging. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I have 18 total, 11 are stars, need non-stars, so I subtract'); practice all unknown positions; connect to familiar experiences.
12. Chen has some pencils. He gets 7 more pencils. Now he has 16 pencils. How many pencils did Chen have at the start? $? + 7 = 16$
    Answer: 9 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is an adding to problem with start unknown. We add to an unknown starting amount to reach a total, and find the start. The story tells us Chen has some pencils, gets 7 more, and now has 16 pencils. Choice C is correct because to find how many pencils Chen had at the start, we subtract: 16 - 7 = 9. We can represent this as ? + 7 = 16. Choice B is a common error where students select a number from the story without solving, such as picking the amount added, 7. This happens because in start unknown problems, students need to reverse the typical operation. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I added 7 to reach 16, need to find the start, so I subtract'); practice all unknown positions; connect to familiar experiences.
13. Amir has 12 toy cars. He gives away some. Now he has 8 toy cars. How many toy cars did Amir give away?
    Answer: 4 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with change unknown. We start with one amount, end with another, and find what was taken away. The story tells us Amir has 12 toy cars and gives away some, now having 8. Choice B is correct because to find how many toy cars Amir gave away, we subtract: 12 - 8 = 4. We can represent this as an equation with unknown: 12 - ? = 8. Choice D is a common error where students might add instead: 12 + 8 = 20, using the wrong operation. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('gives away' indicates subtraction, unknown is the change); model thinking aloud ('I started with 12, ended with 8, to find what was taken, I subtract'); practice all unknown positions; connect to familiar experiences.
14. Jamal has 14 cookies. He eats 6 cookies. How many cookies does Jamal have left? $14 - 6 = ?$
    Answer: 8 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with result unknown. We start with one amount and take away some to find what is left. The story tells us Jamal has 14 cookies and eats 6 cookies. Choice D is correct because to find how many cookies Jamal has left, we subtract: $14 - 6 = 8$. We can represent this as $14 - 6 = ?$. Choice B is a common error where students select a number from the story without solving, such as picking the amount eaten, 6. This happens because calculation facts may not be automatic yet. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I started with 14, took away 6, now I need to find what's left, so I subtract'); practice all unknown positions; connect to familiar experiences.
15. Chen has 6 pencils. He gets some more pencils. Now he has 11 pencils. How many pencils did Chen get?
    Answer: 5 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is an adding to problem with change unknown. We start with one amount, end with the total, and find what was added. The story tells us Chen has 6 pencils and gets some more, now having 11. Choice A is correct because to find how many pencils Chen got, we subtract: 11 - 6 = 5, or think of it as 6 + ? = 11. We can represent this as an equation with unknown: 6 + ? = 11. Choice C is a common error where students select a number from the story without solving, like picking the total 11. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('some more' indicates addition, but unknown is the change); model thinking aloud ('I started with 6, ended with 11, to find what was added, I can subtract or count on'); practice all unknown positions; connect to familiar experiences.
16. Chen has 16 pencils. He gives away some pencils. Now he has 10 pencils. How many pencils did Chen give away?
    Answer: 6 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with change unknown. We start with one amount, end with another, and find what was taken away. The story tells us Chen has 16 pencils and now has 10 pencils after giving away some. Choice A is correct because to find how many pencils Chen gave away, we subtract: 16 - 10 = 6. We can represent this as an equation with unknown: 16 - ? = 10. Choice B is a common error where students add instead of subtracting (16 + 10 = 26); this happens because change unknown problems require reversing the typical operation. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I started with 16, ended with 10, need to find what was taken, so I subtract'); practice all unknown positions; connect to familiar experiences.
17. Jamal has 15 cookies. He eats 7 cookies. How many cookies does Jamal have left?
    Answer: 8 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with result unknown. We start with one amount and take away some to find what's left. The story tells us Jamal has 15 cookies and eats 7. Choice A is correct because to find how many cookies Jamal has left, we subtract: $15 - 7 = 8$. We can represent this as an equation with unknown: $15 - 7 = ?$. Choice D is a common error where students use the wrong operation and add instead: $15 + 7 = 22$. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('left' indicates subtraction); model thinking aloud ('I started with 15, took away 7, now I need to find what's left, so I subtract'); practice all unknown positions; connect to familiar experiences.
18. Marcus saw 12 birds. Yuki saw 9 birds. How many more birds did Marcus see than Yuki?
    Answer: 3 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a comparing problem with difference unknown. We compare two amounts to find how many more or fewer. The story tells us Marcus saw 12 birds and Yuki saw 9 birds. Choice C is correct because to find how many more birds Marcus saw, we subtract: 12 - 9 = 3. We can represent this as an equation with unknown: 12 - 9 = ?. Choice A is a common error where students find the total instead of the difference (12 + 9 = 21); this happens because compare problems require understanding 'how many more' as subtraction. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('Marcus has 12, Yuki 9, need how many more for Marcus, so I subtract'); practice all unknown positions; connect to familiar experiences.
19. Emma has 7 stickers. She gets 6 more stickers. How many stickers does Emma have now?
    Answer: 13 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is an adding to problem with result unknown. We start with one amount and add more to find the total. The story tells us Emma has 7 stickers and gets 6 more. Choice C is correct because to find how many stickers Emma has now, we add: 7 + 6 = 13. We can represent this as an equation with unknown: 7 + 6 = ?. Choice B is a common error where students might subtract instead of add, getting 7 - 6 = 1, but that's not an option; alternatively, they might add incorrectly to get 12. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('more' can mean add or compare); model thinking aloud ('I started with 7, got 6 more, now I need to find the total, so I add'); practice all unknown positions; connect to familiar experiences.
20. Read the story. Jamal has 14 cookies. He eats 6 cookies. How many cookies does Jamal have left?
    Answer: 8 This question tests 1st grade ability to solve addition and subtraction word problems within 20 (CCSS.1.OA.1). This is a taking from problem with result unknown. We start with one amount and take away some to find what's left. The story tells us Jamal has 14 cookies and eats 6. Choice A is correct because to find how many cookies Jamal has left, we subtract: 14 - 6 = 8. We can represent this as 14 - 6 = ?. Choice C is a common error where students add instead of subtracting, getting 14 + 6 = 20. This happens because choosing the operation from word problem context is challenging. To help students: Act out problems with physical objects; draw pictures representing the situation; teach problem type structures explicitly (adding to, taking from, putting together, taking apart, comparing); use consistent language for each type; practice writing equations with boxes for unknowns; emphasize keywords carefully ('left' suggests subtraction); model thinking aloud ('I started with 14, ate 6, now I need to find what's left, so I subtract'); practice all unknown positions; connect to familiar experiences.

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