Count to 20 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. The number between 10 and 12 is 11.
11 comes between 10 and 12 because it is 1 more than 10 and 1 less than 12.
2. Count forward: 5, 6, 7, 8.
When you count in order, each number is 1 more than the one before it. The missing number is 8.
3. The number that comes after 16 is 17.
When you count, 17 comes right after 16 because it is 1 more.
4. Fill in the missing number: 13, 14, 15.
When you count in order, each number is 1 more than the one before it. The missing number is 14.
5. The number just before 20 is 19.
When you count, 19 comes right before 20 because it is 1 less.
6. Count: 1, 2, 3, 4, 5.
When you count in order, each number is 1 more than the one before it. The missing number is 3.
7. What number comes right after 8? 9.
When you count, 9 comes right after 8 because it is 1 more.
8. The missing number is: 17, 18, 19, 20.
When you count in order, each number is 1 more than the one before it. The missing number is 19.
9. Count backward: 12, 11, 10.
When counting backward, each number is 1 less than the one before it. The next number is 10.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Comes after 14
→ 15
9
Comes before 10
→ 9
20
Comes after 19
→ 20
15
Comes before 17
→ 16
16
The number after 14 is 15 (1 more). The number before 10 is 9 (1 less). The number after 19 is 20 (1 more). The number before 17 is 16 (1 less).