Subtraction by Counting On worksheet for kids, teaching subtraction using number lines and counting strategies.

Let's solve the subtraction problems step by step using the two methods: counting on and counting back, as instructed in the worksheet.

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🔹 Part 1: Subtraction by Counting On

This method is used when the numbers are close to each other. You start from the smaller number and count up to the larger number.

#### Example:
For 18 - 15 = 3, you count: 15 → 16 (1), 17 (2), 18 (3) → 3 steps.

Now, let’s solve:

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1. 16 - 12 = ?
Start at 12, count on to 16:
12 → 13 (1), 14 (2), 15 (3), 16 (4) → 4
✔ Answer: 4

2. 8 - 6 = ?
6 → 7 (1), 8 (2) → 2
✔ Answer: 2

3. 19 - 15 = ?
15 → 16 (1), 17 (2), 18 (3), 19 (4) → 4
✔ Answer: 4

4. 20 - 13 = ?
13 → 14 (1), 15 (2), 16 (3), 17 (4), 18 (5), 19 (6), 20 (7) → 7
✔ Answer: 7

5. 28 - 23 = ?
23 → 24 (1), 25 (2), 26 (3), 27 (4), 28 (5) → 5
✔ Answer: 5

6. 27 - 20 = ?
20 → 21 (1), 22 (2), 23 (3), 24 (4), 25 (5), 26 (6), 27 (7) → 7
✔ Answer: 7

7. 24 - 19 = ?
19 → 20 (1), 21 (2), 22 (3), 23 (4), 24 (5) → 5
✔ Answer: 5

8. 22 - 16 = ?
16 → 17 (1), 18 (2), 19 (3), 20 (4), 21 (5), 22 (6) → 6
✔ Answer: 6

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🔹 Part 2: Subtraction by Counting Back

Use this when subtracting a small number from a larger one. Start from the larger number and count backward.

#### Example:
For 18 - 7 = 11, you go: 18 → 17 (1), 16 (2), ..., down to 11.

Now solve:

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1. 20 - 6 = ?
Count back from 20:
20 → 19 (1), 18 (2), 17 (3), 16 (4), 15 (5), 14 (6) → 14
✔ Answer: 14

2. 18 - 4 = ?
18 → 17 (1), 16 (2), 15 (3), 14 (4) → 14
✔ Answer: 14

3. 10 - 2 = ?
10 → 9 (1), 8 (2) → 8
✔ Answer: 8

4. 19 - 7 = ?
19 → 18 (1), 17 (2), 16 (3), 15 (4), 14 (5), 13 (6), 12 (7) → 12
✔ Answer: 12

5. 24 - 4 = ?
24 → 23 (1), 22 (2), 21 (3), 20 (4) → 20
✔ Answer: 20

6. 27 - 8 = ?
27 → 26 (1), 25 (2), 24 (3), 23 (4), 22 (5), 21 (6), 20 (7), 19 (8) → 19
✔ Answer: 19

7. 21 - 6 = ?
21 → 20 (1), 19 (2), 18 (3), 17 (4), 16 (5), 15 (6) → 15
✔ Answer: 15

8. 23 - 7 = ?
23 → 22 (1), 21 (2), 20 (3), 19 (4), 18 (5), 17 (6), 16 (7) → 16
✔ Answer: 16

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✔ Final Answers:

#### Counting On:
1. 16 - 12 = 4
2. 8 - 6 = 2
3. 19 - 15 = 4
4. 20 - 13 = 7
5. 28 - 23 = 5
6. 27 - 20 = 7
7. 24 - 19 = 5
8. 22 - 16 = 6

#### Counting Back:
1. 20 - 6 = 14
2. 18 - 4 = 14
3. 10 - 2 = 8
4. 19 - 7 = 12
5. 24 - 4 = 20
6. 27 - 8 = 19
7. 21 - 6 = 15
8. 23 - 7 = 16

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🎯 Explanation Summary:

- Counting On: Best when the two numbers are close together. Start from the smaller number and count forward to the larger.
- Counting Back: Used when subtracting a small number. Start from the larger number and count backward.
- A number line helps visualize these steps clearly.

These strategies help children build mental math skills and understand subtraction as "how many more?" or "how far apart?"

Let me know if you'd like a printable version or visual number lines! 😊