Addition and subtraction facts – numbers up to 18
Key Notes:
- Adding zero does not change a number.
Learn with an example
🟢Add: 3+7=__
You can count up to add. It is easier to start with the larger number. Start from 7 and count up 3:
7, 8, 9, 10
3+7=10
- The sum is 10.
🟢Add: 0+8=__
Add:
0 + 8 = 8
- The sum is 8.
🟢Subtract. 10-3=__
You can count back to subtract. Start from 10 and count back 3:
10, 9, 8, 7
10–3=7
The difference is 7.
Let’s practice!
