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Math Gym
Subtraction Guide

Subtraction Level 25: 4d - 3d (mastery). borrow-window subtraction.

1. Release thousands

1. Release thousandsRelease one digit; only borrow stays active.
answer strip
Pay right borrow; release 8: 9 - 0 - 1 = 8.

2. Release hundreds

2. Release hundreds
answer strip
Borrow 10; pay right borrow: 10 - 4 - 1 = 5.

3. Release tens

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

4. Release ones

4. Release ones
answer strip
Borrow 10; release 7: 15 - 8 = 7.

5. Read answer

5. Read answerDrop finished digits; borrow is gone.
Read 8 | 5 | 3 | 7 as 8537; borrow is gone.