Common Core: 1st Grade Math : Addition and Subtraction Within 20 to Solve Word Problems: CCSS.MATH.CONTENT.1.OA.A.1

Study concepts, example questions & explanations for Common Core: 1st Grade Math

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Example Questions

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Example Question #1 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Tim’s favorite tree had  branches before the storm last night. He saw  branches in the yard this morning. How many branches are left on the tree? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because the tree lost branches, so it will have less than what it started with. 

We can start at  and count back 

Example Question #2 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Megan has  markers. Ben only has  markers so Megan lets Ben have  of her markers. How many markers does Megan have left? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Megan is giving some of her markers away, so she will have less than what she started with. 

We can start at  and count back .

Example Question #3 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

The toy panda weighs  pounds less than the toy truck. The truck weighs  pounds, how much does the panda weigh? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we are finding the difference in weight between the truck and the panda. 

We can start at  and count back .

Example Question #4 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Jess has  t-shirts in her drawer. This week she has worn  of her t-shirts. How many are left in the drawer? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Jess has worn some of her shirts, so her total number of shirts in the drawer is decreasing.

 

We can start at  and count back .

 

Example Question #5 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Cassie picked  flowers outside. She gave  to her mom, and she wants to give the rest to her sister. How many does she have left for her sister? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Cassie gave some of her flowers away, so she will have less than what she started with. 

We can start at  and count back .

Example Question #6 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Mark has  coins in his pocket. When he gets them out, he drops all but  of them. How many coins did he drop? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Mark dropped some of his coins so he has less than what he started with. 

We can start at  and count back .

Example Question #7 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Toby has  toys in his toy bin. At the end of the day, he has  toys remaining in the bin. How many did he take out? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Toby took toys out of the bin, so he is decreasing the number of toys in his bin. 

We can start at  and count back .

 

Example Question #8 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Ally has  pieces of her Halloween candy left. She decides to share  pieces with her sister. How many pieces does she have left? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Ally is giving some of her candy away, so she will have less than what she started with. 

We can start at  and count back .

Example Question #9 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

David sees  apples on the apple tree. If he picks  of them, how many will be left? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because David is taking away apples. 

We can start at  and count back .

Example Question #10 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

On Christmas Eve morning, a tree lot had  trees left to sell. By the end of the day, they had only  trees left. How many did they sell? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because the tree lot is getting rid of trees, so they have less by the end of the day. 

We can start at  and count back .

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