Subtract doubles
key notes :
What is a Double? 🤔
- A double is when a number is added to itself.
- Example: 2 + 2 = 4 ✅
Subtracting Doubles ➖
- Subtracting doubles means taking away the same number twice from a total.
- Example: 4 − 2 = 2
Common Doubles to Know 📝
| Double | Sum | Example of Subtracting Double |
|---|---|---|
| 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 |
Tip for Easy Subtraction 💡
- Remember the doubles chart → subtracting is like “undoing” a double.
- Example: If you know 5 + 5 = 10, then 10 − 5 = 5.
Fun Trick 🎲
- Use fingers, counters, or objects to see doubles and then subtract.
- Helps you visualize the answer quickly!
Practice Makes Perfect ✏️
- Try small games: “Double 3 is 6. What is 6 − 3?”
- Keep practicing up to 10 or 20 for speed.
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!🖊️
