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Subtraction

Level 24 / mastery

4d - 3d (any)

5 visual steps / borrow-window subtraction

1. Release thousands

1. Release thousandsRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 6: 7 - 0 - 1 = 6.

Pay right borrow; release 6: 7 - 0 - 1 = 6.

2. Release hundreds

2. Release hundredsRelease one digit; only borrow stays active.
answer strip
Borrow 10; pay right borrow: 11 - 5 - 1 = 5.

Borrow 10; pay right borrow: 11 - 5 - 1 = 5.

3. Release tens

3. Release tensRelease one digit; only borrow stays active.
answer strip
Borrow 10; pay right borrow: 13 - 8 - 1 = 4.

Borrow 10; pay right borrow: 13 - 8 - 1 = 4.

4. Release ones

4. Release onesRelease one digit; only borrow stays active.
answer strip
Borrow 10; release 8: 14 - 6 = 8.

Borrow 10; release 8: 14 - 6 = 8.

5. Read answer

5. Read answerRelease one digit; only borrow stays active.Read answerDrop finished digits; borrow is gone.
Read 6 | 5 | 4 | 8 as 6548; borrow is gone.

Read 6 | 5 | 4 | 8 as 6548; borrow is gone.

Practice Level 24

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

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