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Math Gym
Subtraction Guide

Subtraction Level 13: 3d - 2d (cascade borrow). borrow-window subtraction.

1. Release hundreds

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

2. Release tens

2. Release tens
answer strip
Borrow 10; pay right borrow: 11 - 5 - 1 = 5.

3. Release ones

3. Release ones
answer strip
Borrow 10; release 6: 14 - 8 = 6.

4. Read answer

4. Read answerDrop finished digits; borrow is gone.
Read 6 | 5 | 6 as 656; borrow is gone.