Step 4 / 6

Split the first number

★★★Not the suggested order

For 13 − 4, split 13 into 10 and 3: 10 − 4 + 3.

Cloud Bridge · Learn first

Example

Split 14 into 10 and what?

Answer: 4

Steps in this unit · Use 10 to subtract

1 2 3 4 5 6

← Finish from 10 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.

For 13 − 4, split 13 into 10 and 3: 10 − 4 + 3.

This is step 4 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.