Skip to content

Learn

Subtraction

Level 4 / foundation

Mixed 1d/2d - 1d

3 visual steps / borrow-window subtraction

1. Release tens

1. Release tensRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 0: 1 - 0 - 1 = 0.

Pay right borrow; release 0: 1 - 0 - 1 = 0.

2. Release ones

2. Release onesRelease one digit; only borrow stays active.
answer strip
Borrow 10; release 5: 13 - 8 = 5.

Borrow 10; release 5: 13 - 8 = 5.

3. Read answer

3. Read answerRelease one digit; only borrow stays active.Read answerDrop finished digits; borrow is gone.
Read 0 | 5 as 5; borrow is gone.

Read 0 | 5 as 5; borrow is gone.

Practice Level 4

A few quick rounds make each dropped digit feel light; borrow is the only thing to keep.

Start Level