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Subtraction

Level 10 / foundation

2d - 2d (mastery)

3 visual steps / borrow-window subtraction

1. Release tens

1. Release tensRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 3: 9 - 5 - 1 = 3.

Pay right borrow; release 3: 9 - 5 - 1 = 3.

2. Release ones

2. Release onesRelease one digit; only borrow stays active.
answer strip
Borrow 10; release 3: 11 - 8 = 3.

Borrow 10; release 3: 11 - 8 = 3.

3. Read answer

3. Read answerRelease one digit; only borrow stays active.Read answerDrop finished digits; borrow is gone.
Read 3 | 3 as 33; borrow is gone.

Read 3 | 3 as 33; borrow is gone.

Practice Level 10

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

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