Counting Up To 120 - 1st Grade Math

1. Maya counts stickers: 112, 113, 114, ____.
   Answer: 115 This question is all about counting forward by ones. When you see a list of numbers with a blank at the end, your job is to figure out the pattern. Here, each number goes up by exactly 1: from 112 to 113 is one more, from 113 to 114 is one more. So the pattern is "add 1 each time." To find the missing number, take the last number you know, which is 114, and count up one more: 114 + 1 = 115. That's why 115 fills the blank perfectly — it keeps the counting going in order. Now let's look at why the other answers don't work. 113 is a number you already counted — it comes before 114, not after it, so you'd be going backward. 114 is the number right in front of the blank; you can't repeat it, because in counting each number appears only once as you move forward. 116 skips ahead too far — it's what you'd get if you jumped by 2 (from 114 straight to 116) and left out 115 completely. A helpful trick: when you're counting up by ones and the numbers get big, just watch the last digit. Here it goes 2, 3, 4, _ — the next digit in order is 5, giving you 115. Always ask yourself, "What comes right after the last number?" and count up just one step.
2. Sofia starts at 73: 73, 74, 75, 76, ____.
   Answer: 77 This question is all about counting forward by ones. When you see a list of numbers with a blank at the end, your job is to figure out the pattern and keep it going. Here, each number goes up by exactly 1: from 73 to 74, then 74 to 75, then 75 to 76. So each step adds one more. To find the missing number, look at the last number you have, which is 76, and count up one more: 76 + 1 = 77. That's why 77 fills the blank perfectly — it keeps the counting pattern going. Now let's check the wrong choices. The number 75 is already in the list, so it can't be the next one — you don't repeat a number when counting forward. The number 76 is also already there (it's the last number before the blank), so it would mean you stopped counting instead of moving ahead. The number 78 skips ahead too far — it jumps from 76 all the way to 78, which would mean adding 2 instead of 1, breaking the pattern. A good trick to remember: when you count forward by ones, each number is just "one more" than the number before it. Point to the last number, say it out loud, then say the very next number. Practicing counting out loud from any starting point — like 73, 74, 75 — helps you spot the pattern quickly on the test.
3. Count by 10s: 70, 80, 90, ____.
   Answer: 100 When you "count by 10s," you add ten each time you move to the next number. The key thing to watch is the tens digit: it goes up by one, while the ones digit stays the same. Since you're counting by 10s starting from numbers ending in zero, every number in this pattern should also end in zero. Look at the pattern: 70, 80, 90. Each number is 10 more than the one before it. To find the next number, add 10 to 90: 90 + 10 = 100 So the missing number is 100. Notice how the pattern keeps ending in zero, which is a good sign you're counting by 10s correctly. Now let's check the other choices. The answer 91 comes from adding just 1 instead of 10 — that's counting by 1s, not 10s. The answer 95 jumps by 5, which is counting by 5s, a different pattern. The answer 110 skips too far ahead: it's 20 more than 90, as if you added 10 twice instead of once. A helpful trick: when counting by 10s, cover up the ones place and just count the tens like normal counting — 7, 8, 9, 10 — then put the zero back on to get 70, 80, 90, 100. If your answer stops ending in zero, you've made a mistake somewhere!
4. Start at 47 and count on: 47, 48, 49, ____.
   Answer: 50 When you "count on," you say the numbers in order, just like when you count from 1. Each number you say is exactly one more than the number before it. The trick is to look at the pattern already given and keep it going. Look at what you have: 47, 48, 49. Each number goes up by 1. So after 49, you add one more: 49 + 1 = 50. That means 50 comes next! Now let's see why the other choices don't fit. The number 48 is wrong because you already said it — it comes right after 47, not after 49. The number 49 is also wrong because that's the number right before the blank; you can't say the same number twice in a row when counting on. The number 51 skips ahead too far — it comes after 50, so you'd be jumping over a number instead of counting one step at a time. A good way to check yourself: whisper the numbers out loud in order — "47, 48, 49..." — and the very next word your mouth wants to say is the answer. When counting on, always add just 1 each time, and never repeat a number you've already counted.
5. What number comes next: 108, 109, ____?
   Answer: 110 Whenever you see a question that gives you a list of numbers with a blank at the end, you're being asked to find the counting pattern. The best way to do this is to figure out how much the numbers grow each time, then add that same amount to the last number. Look at the numbers: 108, 109, ___ To get from 108 to 109, you count up by 1. So to fill in the blank, you keep counting up by 1 from 109. That gives you 109 + 1 = 110, which is why 110 comes next. Now let's see why the other choices don't work. The number 108 is where you started — you can't go backward, and it already had its turn. The number 109 is the number right before the blank; if you picked this, you would be repeating a number instead of counting forward. The number 111 skips too far ahead — it's what you'd land on if you counted up by 2 instead of 1, or if you counted one extra step past the answer. A helpful strategy: when counting forward, just say the numbers out loud in order — "one hundred eight, one hundred nine, one hundred ten." The next number in counting is always one more than the one before it. Watch out for the trap of repeating a number you already see or jumping ahead by two.
6. Write the numeral for sixty-five.
   Answer: 65 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Key skills include recognizing what number comes next, reading numerals accurately, writing numerals correctly, and representing quantities with written numerals. The stimulus asks to write the numeral for sixty-five. Choice B is correct because the numeral shown reads as 'sixty-five' which is 65. Choice A is a common error where students reverse digits when writing numerals (56 vs 65), which happens because reversing digits is common when writing is still developing. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
7. Count by 10s: 80, 90, 100, ____. What comes next?
   Answer: 110 When you "count by 10s," you're adding 10 each time you move to the next number. The trick is to look at the pattern already given: 80, 90, 100. Each number is exactly 10 more than the one before it — from 80 to 90 is +10, and from 90 to 100 is +10. So to find what comes next, just add 10 to the last number: 100 + 10 = 110. That's your answer! Now let's see why the other choices don't fit. 101 is what you get if you add only 1 instead of 10 — that's counting by 1s, not 10s. 105 jumps by only 5, which would be counting by 5s, not the 10s the question asks for. 120 skips a step entirely: it adds 20 to 100 instead of 10, so it lands on the number after the one we want (it would come after 110, not right after 100). A helpful trick for counting by 10s: watch the tens digit go up by one each time while the ones digit stays 0. Say them out loud like a rhythm — "eighty, ninety, one hundred, one hundred ten." When the numbers all end in 0, your next number should end in 0 too. Any answer ending in a different digit (like 101 or 105) is a clue you've slipped out of the 10s pattern.
8. Start at 97. What number comes after 99?
   Answer: 100 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Key skills include recognizing what number comes next, reading numerals accurately, writing numerals correctly, and representing quantities with written numerals. Important transitions occur at decade boundaries (29→30, 99→100) and in teen numbers (11-19). The stimulus asks for the number after 99 when starting at 97, involving a decade transition to three-digit numbers. Choice C is correct because after 99 comes 100, entering the three-digit numbers. Choice B is a common error where students skip numbers in sequence, like jumping to 101, which happens because decade transitions require understanding place value. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
9. Count on from 47: 47, 48, 49, ____.
   Answer: 50 When you "count on," you say numbers in order, just like when you count out loud. Each number is exactly one more than the number before it. The trick is to look at the pattern already given and keep it going. Let's look at what you already have: 47, 48, 49. Notice how each number goes up by 1: from 47 you add 1 to get 48, add 1 again to get 49. So what comes right after 49? You add 1 more: 49 + 1 = 50. That's why 50 fills the blank perfectly. Now let's check why the other choices don't work. 48 is a number you already said — it comes right after 47, not after 49, so it's too early in the count. 49 is the number sitting right before the blank, and you can't repeat it; counting always moves forward to a new number. 51 skips over 50 entirely — that would be like counting 49, then jumping to 51 and forgetting a number, so it's too big by one. A helpful strategy: whenever you see "count on," just point at the last number given and ask yourself, "What is one more?" You can even count on your fingers starting from that number. Keep going by ones and you'll never lose your place — and remember, the answer is always bigger than the last number shown, never the same or skipped ahead.
10. What number comes next: 58, 59, ____, 61?
    Answer: 60 When you see a list of numbers with a blank, you're looking at a counting sequence. The trick is to figure out the pattern: are the numbers going up by 1, by 2, or some other amount? Here, you count 58, 59, then a blank, then 61. Look at how the numbers grow: from 58 to 59 is one step up, and to get to 61 you need to fill in the number just before it. Counting forward, after 59 comes 60, and then 60 leads right into 61. So the blank is 60. Say it out loud: "fifty-eight, fifty-nine, sixty, sixty-one" — it flows perfectly! Now let's check why the others don't fit. Choosing 59 just repeats the number that's already there, but each number in a counting sequence should be new. Picking 61 copies the number that already comes after the blank — you can't have 61 twice in a row like "59, 61, 61." Choosing 62 skips too far ahead; 62 actually comes after 61, not before it, so it would break the order. A helpful strategy: whenever you have a missing number in a row, gently count on your fingers or whisper the numbers in order. The blank is always the number you'd naturally say next. Watch out for the tempting traps of repeating a number you already see or jumping ahead — the answer is usually the very next counting number.
11. What number comes before 70?
    Answer: 69 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Key skills include recognizing what number comes next, reading numerals accurately, writing numerals correctly, and representing quantities with written numerals. The stimulus asks for the number that comes before 70. Choice A is correct because 69 comes immediately before 70 in the counting sequence. Choice B is a common error where students confuse before and after, saying 71 instead, which happens because the counting sequence to 120 is extensive and requires practice. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
12. Write the numeral for one hundred fifteen.
    Answer: 115 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Key skills include recognizing what number comes next, reading numerals accurately, writing numerals correctly, and representing quantities with written numerals. The stimulus asks to write the numeral for the number word 'one hundred fifteen.' Choice C is correct because the numeral for one hundred fifteen is 115. Choice A is a common error where students reverse digits when writing numerals (115 vs 151), which happens because reversing digits is common when writing is still developing. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
13. What number is missing: 28, 29, ____, 31?
    Answer: 30 When you see a row of numbers with a blank, you're working with a counting sequence. The trick is to figure out the pattern — how much are the numbers going up (or down) each time? Look at the numbers you already have: 28, 29, ___, 31. Count them out loud: twenty-eight, twenty-nine... what comes next? Each number is going up by one, just like when you count normally. After 29 comes 30, and then 31 follows right after. So the missing number is 30, and it fits perfectly because 30 is one more than 29 and one less than 31. Now let's check the other choices. The number 29 is already in the sequence — it's sitting right before the blank, so it can't be the missing one. The number 31 is also already there, on the other side of the blank, so it's used up too. The number 32 comes after 31, so it's too big to fit in the middle of the row — it would jump past the spot you need to fill. A helpful strategy: whenever a number is missing in a counting list, just count slowly starting from the first number, pointing to each spot. When you reach the blank, the number you say out loud is your answer. Counting "28, 29, 30, 31" makes 30 pop right into place.
14. What number comes after 99?
    Answer: 100 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Important transitions occur at decade boundaries (29→30, 99→100) and in teen numbers (11-19). The stimulus asks for the number that comes after 99. Choice B is correct because after 99 comes 100, entering the three-digit numbers. Choice A is a common error where students skip over 100 to 101, which happens because decade transitions require understanding place value. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
15. What number comes after 19 in counting?
    Answer: 20 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Important transitions occur at decade boundaries (29→30, 99→100) and in teen numbers (11-19). The stimulus asks for the number that comes after 19 in counting. Choice C is correct because after 19 comes 20, transitioning to the next decade. Choice A is a common error where students confuse teen numbers with decade numbers (19 vs 29), which happens because teen numbers have unusual names that don't match their structure. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
16. Write the numeral for the number word: sixty-five.
    Answer: 65 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Key skills include recognizing what number comes next, reading numerals accurately, writing numerals correctly, and representing quantities with written numerals. Important transitions occur at decade boundaries (29→30, 99→100) and in teen numbers (11-19). The stimulus asks to write the numeral for the number word 'sixty-five.' Choice B is correct because 65 is the numeral that represents sixty-five. Choice A is a common error where students reverse digits when writing numerals (56 vs 65), which happens because reversing digits is common when writing is still developing. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
17. Maya writes pages: 108, 109, ____, 111.
    Answer: 110 When you see a list of numbers with a blank in the middle, you're looking at a counting pattern. The trick is to notice how the numbers change from one to the next. Here, Maya's pages go 108, 109, ____, 111. Each number jumps up by one: 108 → 109 is "add 1," so the pattern is simply counting forward. To find the missing page, keep counting: after 109 comes 110, and after 110 comes 111. That fits perfectly! So the blank must be 110 — it comes right after 109 and right before 111, keeping the count smooth and in order. Now let's check why the others don't work. 109 is wrong because that number is already written right before the blank — you can't use the same page twice in a row when counting up. 111 is wrong because 111 already appears at the end of the list; the blank comes before it, so it must be smaller. 112 is wrong because it's too big — 112 would come after 111, but the blank sits before 111, so the missing number has to be less than 111. A helpful trick for these: read the numbers out loud in order like you're counting your steps. If it sounds smooth with no skips and no repeats, you've found the right number. Always check that your answer is bigger than the number before it and smaller than the number after it.
18. Chen is on page 119. What page is next?
    Answer: 120 This question tests 1st grade ability to count to 120, starting at any number less than 120 (CCSS.1.NBT.1). Students must know the counting sequence from 1 to 120 and be able to start counting at any number within that range. Key skills include recognizing what number comes next, reading numerals accurately, writing numerals correctly, and representing quantities with written numerals. The stimulus asks what page comes after 119 for Chen. Choice B is correct because 120 comes immediately after 119 in the counting sequence. Choice C is a common error where students skip over 120 to 121, which happens because the counting sequence to 120 is extensive and requires practice. To help students: Use hundreds charts for visual reference; practice counting aloud daily, starting from different numbers; emphasize decade transitions explicitly (29→30, 99→100); provide practice reading and writing numerals with immediate feedback; use physical objects organized in groups of 10 to show quantities; teach teen numbers as 'ten and ___' (thirteen = 10 and 3); practice skip counting by 10s regularly; connect counting to real contexts (pages, calendar dates, collections).
19. Find the missing number: 28, 29, ____, 31.
    Answer: 30 When you see a list of numbers with a blank, you're working with a number sequence. The trick is to figure out the pattern — how the numbers change from one to the next — and then use that pattern to fill in the gap. Look at the numbers you already have: 28, 29, ___, 31. Each number is going up by 1 as you count forward, just like when you count out loud. After 28 comes 29, and after 31 you'd say 32. So what comes right after 29 and right before 31? Counting up, 29 → 30 → 31, which means the missing number is 30. Now let's check the other choices. Picking 29 repeats the number that's already sitting right before the blank — but a counting sequence keeps moving forward, so you can't reuse it. Choosing 31 copies the number that comes after the blank, so it would put 31 in the list twice, which breaks the count. Selecting 32 jumps too far ahead — 32 is the number that would come after 31, not before it, so it doesn't fit in the space between 29 and 31. A helpful strategy: when a number is missing in the middle, point to the number just before it and count one more. Whisper the numbers out loud — "28, 29, 30, 31" — and your ear will often catch the missing one before your pencil does!
20. Count by 10s: 80, 90, 100, ____.
    Answer: 110 When you "count by 10s," you're adding 10 each time you jump to the next number. The trick is to watch how the tens digit grows while the ones digit stays at zero. Look at the pattern: 80, 90, 100... each number is exactly 10 bigger than the one before it. To find the missing number, start at 100 and add 10 more: 100 + 10 = 110. So the next number in the pattern is 110. Notice how it still ends in zero, just like every other number in the list — that's a clue you're counting by 10s correctly. Now let's see why the other choices don't fit. 101 is only 1 more than 100, which means you counted by 1s, not 10s. 105 jumps by 5, so that's counting by 5s — close, but not the right step size. 120 skips too far ahead; it's 20 more than 100, meaning you added 10 twice instead of once. The pattern only asks for the very next number, so you should land on 110, not overshoot it. A helpful tip: when you count by 10s, every number should end in the same ones digit (here, a zero), and only the tens place changes. If your answer ends in a different digit like 1 or 5, that's a warning sign you switched to counting by 1s or 5s by mistake.

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