Count to 20 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Count forward: 15, 16, 17, 18.
When you count in order, each number is 1 more than the one before it. The missing number is 17.
2. The number right before 6 is 5.
When you count, 5 comes right before 6 because it is 1 less.
3. What number comes after 11? 12.
When you count, 12 comes right after 11 because it is 1 more.
4. Fill in the gap: 2, 3, 4, 5.
When you count in order, each number is 1 more than the one before it. The missing number is 4.
5. The number between 18 and 20 is 19.
19 comes between 18 and 20 because it is 1 more than 18 and 1 less than 20.
6. Count: 8, 9, 10, 11.
When you count in order, each number is 1 more than the one before it. The missing number is 9.
7. What comes right before 14? 13.
When you count, 13 comes right before 14 because it is 1 less.
8. Fill in: 6, 7, 8, 9.
When you count in order, each number is 1 more than the one before it. The missing number is 9.
9. The number after 0 is 1.
The very first number you say when you start counting is 1.
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 6
→ 7
3
Comes before 4
→ 3
13
Comes after 12
→ 13
7
Comes before 19
→ 18
18
The number after 6 is 7 (1 more). The number before 4 is 3 (1 less). The number after 12 is 13 (1 more). The number before 19 is 18 (1 less).