Subtraction within 10, step by step
Subtraction within 10 turns taking away into a set of facts children can recognize quickly.
The question
10 − 9
10−9
10−0=10
9=0+9
10−9=1
- 10 − 9. The ones cannot cover it — 0 is less than 9 — so drop to the ten below first.
- 10 − 0 = 10. That used 0 of the 9, leaving 9 still to take.
- Then the rest off the ten: 10 − 9 = 1.
How it works.
- 01
10 − 9. The ones cannot cover it — 0 is less than 9 — so drop to the ten below first.
- 02
10 − 0 = 10. That used 0 of the 9, leaving 9 still to take.
- 03
Then the rest off the ten: 10 − 9 = 1.