Subtract doubles
key notes :
Definition:
- Subtracting doubles involves subtracting the same number from itself. For example, 4 – 4, 6 – 6, etc.
Key Concepts:
- Understanding Doubles:
- Doubles are numbers that are the same. For instance, double of 3 is 3 + 3 = 6.
- Common doubles: (1, 1), (2, 2), (3, 3), (4, 4), (5, 5), etc.
- Subtraction of Doubles:
- When you subtract a double number from itself, the answer is always 0.
- Example:
- 2 – 2 = 0
- 5 – 5 = 0
- 7 – 7 = 0
- Visual Representation:
- Use objects or drawings to illustrate subtracting doubles.
- For example, if you have 4 apples and you take away 4 apples, you have 0 apples left.
Related facts
| Doubles Addition | Doubles Subtraction |
| 1+1=2 | 2–1=1 |
| 2+2=4 | 4–2=2 |
| 3+3=6 | 6–3=3 |
| 4+4=8 | 8–4=4 |
| 5+5=10 | 10–5=5 |
| 6+6=12 | 12–6=6 |
| 7+7=14 | 14–7=7 |
| 8+8=16 | 16–8=8 |
| 9+9=18 | 18–9=9 |
| 10+10=20 | 20–10=10 |
Learn with an example
Subtract.
10 – 5 =
Look at the subtraction number sentence.
10 – 5 = ?
Think of the related addition number sentence. It uses the same numbers.
5 + ? = 10
The doubles addition fact for 5s shows the missing number. It is 5.
5 + 5 = 10
So:
10 – 5 = 5
Subtract.
6 – 3 =
Look at the subtraction number sentence.
6 – 3 = ?
Think of the related addition number sentence. It uses the same numbers.
3 + ? = 6
The doubles addition fact for 3s shows the missing number. It is 3.
3 + 3 = 6
So:
6 – 3 = 3
Subtract.
6 – 3 =
Look at the subtraction number sentence.
6 – 3 = ?
Think of the related addition number sentence. It uses the same numbers.
3 + ? = 6
The doubles addition fact for 3s shows the missing number. It is 3.
3 + 3 = 6
So:
6 – 3 = 3
Let’s practice!🖊️
