Count to 100 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. One more than 85 is 86
Eighty-five plus one equals eighty-six because one more always adds a single one.
2. One less than 30 is 29
Thirty minus one is twenty-nine, the number that comes right before thirty.
3. 44, 45, 46, 47
Counting in order, forty-six fits between forty-five and forty-seven on the chart.
4. One more than 53 is 54
Fifty-three plus one is fifty-four, since one more means add a single one.
5. One less than 81 is 80
Eighty-one minus one equals eighty, which is the number right before eighty-one.
6. Missing: 88, 89, 90
After eighty-nine comes ninety when counting in order, because we add just one.
7. One more than 67 is 68
Sixty-seven plus one is sixty-eight, the number that follows in counting order.
8. One less than 91 is 90
Ninety-one minus one is ninety, the number that comes right before ninety-one.
9. Missing: 56, 57, 58
On a 100-chart, fifty-seven fits between fifty-six and fifty-eight in counting order.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
One more than 39
→ 40
40
One less than 70
→ 69
69
One more than 88
→ 89
89
One less than 51
→ 50
50
Each pair changes by just one, so add or subtract one to find the match.