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Math Gym
Subtraction Guide

Subtraction Level 12: 3d - 2d (borrow ones). borrow-window subtraction.

1. Release hundreds

1. Release hundredsRelease one digit; only borrow stays active.
answer strip
7 - 0 = 7; drop 7.

2. Release tens

2. Release tens
answer strip
Pay right borrow; release 1: 6 - 4 - 1 = 1.

3. Release ones

3. Release ones
answer strip
Borrow 10; release 5: 12 - 7 = 5.

4. Read answer

4. Read answerDrop finished digits; borrow is gone.
Read 7 | 1 | 5 as 715; borrow is gone.