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Subtraction

Level 14 / build-up

3d - 2d (any)

4 visual steps / borrow-window subtraction

1. Release hundreds

1. Release hundredsRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 4: 5 - 0 - 1 = 4.

Pay right borrow; release 4: 5 - 0 - 1 = 4.

2. Release tens

2. Release tensRelease one digit; only borrow stays active.
answer strip
Borrow 10; pay right borrow: 11 - 9 - 1 = 1.

Borrow 10; pay right borrow: 11 - 9 - 1 = 1.

3. Release ones

3. Release onesRelease one digit; only borrow stays active.
answer strip
Borrow 10; release 6: 13 - 7 = 6.

Borrow 10; release 6: 13 - 7 = 6.

4. Read answer

4. Read answerRelease one digit; only borrow stays active.Read answerDrop finished digits; borrow is gone.
Read 4 | 1 | 6 as 416; borrow is gone.

Read 4 | 1 | 6 as 416; borrow is gone.

Practice Level 14

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

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