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Math Gym
Subtraction Guide

Subtraction Level 19: 3d - 3d (any). borrow-window subtraction.

1. Release hundreds

1. Release hundredsRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 2: 7 - 4 - 1 = 2.

2. Release tens

2. Release tens
answer strip
Borrow 10; pay right borrow: 11 - 8 - 1 = 2.

3. Release ones

3. Release ones
answer strip
Borrow 10; release 7: 13 - 6 = 7.

4. Read answer

4. Read answerDrop finished digits; borrow is gone.
Read 2 | 2 | 7 as 227; borrow is gone.