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Math Gym
Subtraction Guide

Subtraction Level 29: 4d - 4d (any). borrow-window subtraction.

1. Release thousands

1. Release thousandsRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 1: 7 - 5 - 1 = 1.

2. Release hundreds

2. Release hundreds
answer strip
Borrow 10; pay right borrow: 14 - 8 - 1 = 5.

3. Release tens

3. Release tens
answer strip
Borrow 10; pay right borrow: 13 - 6 - 1 = 6.

4. Release ones

4. Release ones
answer strip
Borrow 10; release 7: 11 - 4 = 7.

5. Read answer

5. Read answerDrop finished digits; borrow is gone.
Read 1 | 5 | 6 | 7 as 1567; borrow is gone.