You're looking at a
Year 1 subtraction worksheet that uses a
number line to help children visualize and solve subtraction problems.
The goal is to
use the number line (from 0 to 20) to “count back” from the first number (the minuend) by the second number (the subtrahend) to find the difference.
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✔ How to use the number line for subtraction:
1. Start at the
first number (e.g., 17).
2. Move
left (backwards) along the number line by the
second number (e.g., 10 steps back from 17).
3. The number you land on is your answer.
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🔢 Let’s solve all the problems step-by-step:
#### Left Worksheet (same as right, just shown larger):
1.
17 – 10 = ?
- Start at 17 → count back 10 → land on
7
2.
18 – 7 = ?
- Start at 18 → count back 7 → land on
11
3.
18 – 8 = ?
- Start at 18 → count back 8 → land on
10
4.
19 – 10 = ?
- Start at 19 → count back 10 → land on
9
5.
19 – 4 = ?
- Start at 19 → count back 4 → land on
15
6.
20 – 14 = ?
- Start at 20 → count back 14 → land on
6
7.
14 – 11 = ?
- Start at 14 → count back 11 → land on
3
8.
15 – 6 = ?
- Start at 15 → count back 6 → land on
9
9.
16 – 8 = ?
- Start at 16 → count back 8 → land on
8
10.
20 – 12 = ?
- Start at 20 → count back 12 → land on
8
11.
19 – 7 = ?
- Start at 19 → count back 7 → land on
12
12.
17 – 9 = ?
- Start at 17 → count back 9 → land on
8
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#### Right Worksheet (same problems, slightly different order):
1.
17 – 10 = 7
2.
18 – 7 = 11
3.
18 – 8 = 10
4.
19 – 10 = 9
5.
19 – 4 = 15
6.
20 – 14 = 6
7.
14 – 11 = 3
8.
15 – 6 = 9
9.
16 – 8 = 8
10.
20 – 12 = 8
11.
19 – 7 = 12
12.
17 – 9 = 8
13.
20 – 11 = 9
14.
21 – 13 = 8
> 💡 Wait — the right worksheet has two extra problems not visible on the left:
>
20 – 11 = ? → Start at 20, count back 11 →
9
>
21 – 13 = ? → Start at 21, count back 13 →
8
*(Note: The number line only goes to 20, but 21 is included — students can still count back from 21 even if it’s off the line, or they may need to extend mentally.)*
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✍️ Final Answers (for both sheets):
✔ Left Sheet Answers:
| Problem | Answer |
|---------------|--------|
| 17 – 10 | 7 |
| 18 – 7 | 11 |
| 18 – 8 | 10 |
| 19 – 10 | 9 |
| 19 – 4 | 15 |
| 20 – 14 | 6 |
| 14 – 11 | 3 |
| 15 – 6 | 9 |
| 16 – 8 | 8 |
| 20 – 12 | 8 |
| 19 – 7 | 12 |
| 17 – 9 | 8 |
✔ Right Sheet Additional Answers:
| Problem | Answer |
|---------------|--------|
| 20 – 11 | 9 |
| 21 – 13 | 8 |
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🎯 Teaching Tip:
This worksheet reinforces
mental math strategies using visual aids. Children learn that subtraction means “taking away” or “moving backwards” on a number line — building foundational understanding for more complex arithmetic later.
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✔ All answers filled in! You can now complete the worksheet confidently. 😊
Parent Tip: Review the logic above to help your child master the concept of subtraction worksheet numbers 1 20.
