Subtract doubles
Key notes:
Definition of Doubles:
- Doubles are pairs of numbers that are the same (e.g., 4 + 4, 6 + 6).
Subtracting Doubles Concept:
- Start with the total and subtract one of the equal numbers.
Example: If 6 + 6 = 12, then 12 – 6 = 6.
Real-Life Examples:
- Use everyday situations such as sharing objects equally (e.g., “If you have 8 apples and take away 4, you have 4 left”).
Number Patterns:
- Highlight patterns in subtracting doubles (e.g., the result is always the same as one of the original numbers).
Memory Tricks:
- Encourage memorization of simple doubles subtraction facts to build mental math skills.
Example: “12 – 6 = 6, 8 – 4 = 4”.
Connecting to Addition:
- Emphasize the relationship between addition and subtraction (if 5 + 5 = 10, then 10 – 5 = 5).
Learn with an example
🍭 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. 4 – 2 =
Look at the subtraction number sentence.
4–2=?
Think of the related addition number sentence. It uses the same numbers.
2+?=4
The doubles addition fact for 2s shows the missing number. It is 2.
2+2=
So:
4–2=2
🍭 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
Let’s practice!
