This grade 1 numbers worksheet answer key solves all 23 problems of the counting to 120 worksheet step by step.
Use this key to check each answer. Every problem shows the counting steps and the answer in bold. Fill-in problems have a picture with the missing numbers colored, so children can see where each number belongs.
Grade 1 Numbers Worksheet Answer Key: problems 1–5
Problem 1: Fill the number boxes
Count forward: 23, 24, 25, 26, 27.
The missing number is 25.
Problem 2: Count on from 48
After 48 comes 49. Then 50, 51, and 52.
The numbers are 49, 50, 51, 52.
Problem 3: Count the dots
Three rows have 10 dots each. Count 10, 20, then keep going by ones. Count the last 6 dots: 31, 32, 33, 34, 35, 36.
There are 36 dots.
Problem 4: Write forty-seven
Forty is 4. Seven is 7. Write 4 and then 7.
The numeral is 47.
Problem 5: Write sixty-two in words
The word for 6 in the tens place is sixty. Then say two.
The word is sixty-two.
Grade 1 Numbers Worksheet Answer Key: problems 6–10
Problem 6: Fill the hundred chart
Each number is one more than the number on its left. After 44 comes 45. After 51 comes 52. After 57 comes 58.
The missing numbers are 45, 52, and 58.
Problem 7: After ninety-nine
After 99 the counting goes to three digits.
The number after 99 is 100.
Problem 8: Count on from 97
Count on: 98, 99, 100, 101, 102, 103.
The numbers are 98, 99, 100, 101, 102, 103.
Problem 9: Fill the number line
Count along the line: 110, 111, 112, 113, 114, 115, 116, 117.
The missing numbers are 113 and 117.
Problem 10: Column pattern
The numbers in the blue column are 17, 27, 37, and 57. All of them end in 7.
The number that fits is 47.
Grade 1 Numbers Worksheet Answer Key: problems 11–15
Problem 11: Write one hundred five
Write 1 for one hundred. Then write 05 for five.
The numeral is 105.
Problem 12: Write 118 in words
Start with one hundred. Then say eighteen.
The word is one hundred eighteen.
Problem 13: Missing number 81
Count in order: 79, 80, 81, 82.
The missing number is 81.
Problem 14: Liam's counting mistake
Counting forward, the number after 39 is 40, not 50.
Liam should say 40.
Problem 15: Start of the next row
After 70 comes 71. The next row starts with the number that comes next.
The first number is 71.
Grade 1 Numbers Worksheet Answer Key: problems 16–20
Problem 16: Count past 110
Count forward: 109, 110, 111, 112, 113, 114.
The missing numbers are 111, 113, and 114.
Problem 17: Choose the numeral
One hundred is 1. Twelve is 12. Put them together.
The numeral is 112.
Problem 18: Mr. Lee's school days
Tomorrow is one more day. After 74 comes 75.
Tomorrow is day 75.
Problem 19: Jamal's book
After 99 comes 100.
He sees page 100.
Problem 20: Sofia's pennies
Count in order: 116, 117, 118, 119, 120.
The missing number is 118. After 119 she says 120.
Grade 1 Numbers Worksheet Answer Key: problems 21–23
Problem 21: Diego counts forward
Count on: 57, 58, 59, 60, 61, 62. That is six numbers.
The last number is 62.
Problem 22: Ethan counts from 103
Count: 103, 104, 105, 106, 107, 108, 109, 110.
The numbers are 103, 104, 105, 106, 107, 108, 109, 110.
Problem 23: Mei's stickers
Count the 3 rows: 10, then 20, then 30. Keep counting on 8 more: 31, 32, 33, 34, 35, 36, 37, 38. One more sticker is 39.
The last number is 39.
How to use this grade 1 numbers worksheet answer key
Read this grade 1 numbers worksheet answer key after trying each problem yourself, and redo any problem you missed.
See every chapter on the Grade 1 math page.