Take from the 10 first

Use 10 to subtract · Numbers & Operations

When the ones are not enough, as in 14 − 9, use the 10. This is the idea behind borrowing.

This is step 5 of unit 42, “Use 10 to subtract”, in Stage 2: Numbers to 100, carrying and borrowing (ages 7–8). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.