Subtraction within 10

Practice Practice sheet New questions

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.