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Subtraction

Level 17 / build-up

3d - 3d (borrow ones)

4 visual steps / borrow-window subtraction

1. Release hundreds

1. Release hundredsRelease one digit; only borrow stays active.
answer strip
8 - 2 = 6; drop 6.

8 - 2 = 6; drop 6.

2. Release tens

2. Release tensRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 2: 6 - 3 - 1 = 2.

Pay right borrow; release 2: 6 - 3 - 1 = 2.

3. Release ones

3. Release onesRelease one digit; only borrow stays active.
answer strip
Borrow 10; release 5: 12 - 7 = 5.

Borrow 10; release 5: 12 - 7 = 5.

4. Read answer

4. Read answerRelease one digit; only borrow stays active.Read answerDrop finished digits; borrow is gone.
Read 6 | 2 | 5 as 625; borrow is gone.

Read 6 | 2 | 5 as 625; borrow is gone.

Practice Level 17

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

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