Number Line Addition & Subtraction — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. I start at 6 and land on 14. I jumped 8 spaces right.
From 6 to 14 is 8 steps, so the missing jump is 8 spaces right.
2. 4 + 8 = 12. Use the number line to find the jump.
Starting at 4 and landing on 12 means jumping 8 right, so the missing addend is 8.
3. I start at 15 and land on 9. I jumped 6 spaces left.
From 15 down to 9 is 6 jumps left, showing the missing subtraction jump.
4. 7 + 4 = 11. The jump covers four spaces to the right.
7 plus 4 equals 11, so the missing second addend is 4.
5. Start at 3, land on 10. Missing jump = 7.
The space between 3 and 10 is 7, which is the missing jump length.
6. 13 - 5 = 8. Count the left jumps between 13 and 8.
Jumping 5 left from 13 lands on 8, so the missing number is 5.
7. I begin at 2 and finish at 11. I jumped 9 right.
The distance from 2 to 11 is 9 spaces, which is the jump length.
8. 6 + 9 = 15. Count the spaces from 6 to 15.
From 6 to 15 on the line is 9 jumps, so the missing addend is 9.
9. Start at 16, land on 12. Missing jump = 4 left.
From 16 to 12 is 4 jumps left, matching 16 - 4 = 12.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Start 5, land 9
→ 4 right
4 right
Start 10, land 4
→ 6 left
6 left
3 + ? = 11
→ 6 right
8 right
14 - ? = 8
→ 6 left
6 right
Each pair links a start/land story or missing addend to the correct jump size and direction on the number line.