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Subtraction

Level 29 / mastery

4d - 4d (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 1: 7 - 5 - 1 = 1.

Pay right borrow; release 1: 7 - 5 - 1 = 1.

2. Release hundreds

2. Release hundredsRelease one digit; only borrow stays active.
answer strip
Borrow 10; pay right borrow: 14 - 8 - 1 = 5.

Borrow 10; pay right borrow: 14 - 8 - 1 = 5.

3. Release tens

3. Release tensRelease one digit; only borrow stays active.
answer strip
Borrow 10; pay right borrow: 13 - 6 - 1 = 6.

Borrow 10; pay right borrow: 13 - 6 - 1 = 6.

4. Release ones

4. Release onesRelease one digit; only borrow stays active.
answer strip
Borrow 10; release 7: 11 - 4 = 7.

Borrow 10; release 7: 11 - 4 = 7.

5. Read answer

5. Read answerRelease one digit; only borrow stays active.Read answerDrop finished digits; borrow is gone.
Read 1 | 5 | 6 | 7 as 1567; borrow is gone.

Read 1 | 5 | 6 | 7 as 1567; borrow is gone.

Practice Level 29

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

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