Counting and Writing Numbers to 120 — Answer Key
Part A: Fill in the Missing Number
Write the missing number on each line.
1. 62, 63, 64, 65, 66.
Counting by 1s from 63 gives 64.
2. The number just before 90 is 89.
When counting by 1s, the number before 90 is 89.
3. 105, 106, 107, 108, 109.
Counting by 1s from 107 gives 108.
4. 113, 114, 115, 116, 117.
Counting by 1s, the number before 114 is 113.
5. The number just after 99 is 100.
When counting by 1s, the number after 99 is 100.
6. Count backward: 85, 84, 83, 82, 81.
Counting backward by 1s from 84 gives 83.
7. Count backward: 120, 119, 118, 117, 116.
Counting backward by 1s from 119 gives 118.
8. 71, 72, 73, 74, 75.
Counting by 1s from 71 gives 72.
9. Count backward: 103, 102, 101, 100, 99.
Counting backward by 1s from 101 gives 100.
Part B: Matching
Match each clue on the left to the correct number on the right.
1. Draw a line to match.
One less than 70
→ 69
109
One more than 99
→ 100
100
Between 108 and 110
→ 109
69
Ten less than 120
→ 110
110
One less than 70 is 69. One more than 99 is 100. The number between 108 and 110 is 109. Ten less than 120 is 110.