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Subtraction

Level 27 / mastery

4d - 4d (borrow ones)

5 visual steps / borrow-window subtraction

1. Release thousands

1. Release thousandsRelease one digit; only borrow stays active.
answer strip
8 - 3 = 5; drop 5.

8 - 3 = 5; drop 5.

2. Release hundreds

2. Release hundredsRelease one digit; only borrow stays active.
answer strip
6 - 2 = 4; drop 4.

6 - 2 = 4; drop 4.

3. Release tens

3. Release tensRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 2: 4 - 1 - 1 = 2.

Pay right borrow; release 2: 4 - 1 - 1 = 2.

4. Release ones

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

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

5. Read answer

5. Read answerRelease one digit; only borrow stays active.Read answerDrop finished digits; borrow is gone.
Read 5 | 4 | 2 | 5 as 5425; borrow is gone.

Read 5 | 4 | 2 | 5 as 5425; borrow is gone.

Practice Level 27

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

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