Let's solve each subtraction problem using the
number line method, as shown in the worksheet. The idea is to
start at the first number (the minuend) and then
move left by the number of steps equal to the second number (the subtrahend).
---
🔹 Problem 1: 14 - 4 = ?
We are already given this one:
- Start at
14
- Move
4 steps to the left:
14 → 13 → 12 → 11 → 10
- Final answer:
10
✔ So,
14 - 4 = 10 ✔️
---
🔹 Problem 2: 18 - 5 = ?
- Start at
18
- Move
5 steps to the left:
- 18 → 17 (1)
- 17 → 16 (2)
- 16 → 15 (3)
- 15 → 14 (4)
- 14 → 13 (5)
✔ So,
18 - 5 = 13
---
🔹 Problem 3: 14 - 4 = ?
This is the same as the first one.
- Start at
14
- Move
4 steps to the left:
14 → 13 → 12 → 11 → 10
✔ So,
14 - 4 = 10
---
🔹 Problem 4: 21 - 7 = ?
- Start at
21
- Move
7 steps to the left:
- 21 → 20 (1)
- 20 → 19 (2)
- 19 → 18 (3)
- 18 → 17 (4)
- 17 → 16 (5)
- 16 → 15 (6)
- 15 → 14 (7)
✔ So,
21 - 7 = 14
---
🔹 Problem 5: 15 - 4 = ?
- Start at
15
- Move
4 steps to the left:
- 15 → 14 (1)
- 14 → 13 (2)
- 13 → 12 (3)
- 12 → 11 (4)
✔ So,
15 - 4 = 11
---
🔹 Problem 6: 10 - 4 = ?
- Start at
10
- Move
4 steps to the left:
- 10 → 9 (1)
- 9 → 8 (2)
- 8 → 7 (3)
- 7 → 6 (4)
✔ So,
10 - 4 = 6
---
✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 14 - 4 = |
10 |
| 18 - 5 = |
13 |
| 14 - 4 = |
10 |
| 21 - 7 = |
14 |
| 15 - 4 = |
11 |
| 10 - 4 = |
6 |
---
📌 How to Use the Number Line:
1. Find the
starting number on the number line.
2. Since it’s
subtraction, move
left (backward).
3. Count the number of steps equal to the number you're subtracting.
4. The number you land on is your
answer.
You can draw arrows like in the example (red arrows showing –1 each step) to visualize the process.
Let me know if you'd like a visual version of these steps!
Parent Tip: Review the logic above to help your child master the concept of subtraction using a number line worksheet.
