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Math Gym
Addition Guide

Addition Level 25: 4d + 3d (mastery). large answer-window addition.

1. Fill thousands

Step 1: Fill thousands
raw windows
running strip
Thousands window: 7 + 0 = 7. Hold 7; wait for carry from the next window.

2. Fill hundreds

Step 2: Fill hundreds
raw windows
running strip
Hundreds window: 8 + 9 = 17. Hold raw 17; settle carry later.

3. Fill tens

Step 3: Fill tens
raw windows
running strip
Tens window: 6 + 2 = 8. Hold 8; wait for carry from the next window.

4. Fill ones

Step 4: Fill ones
raw windows
running strip
Ones window: 5 + 8 = 13. Hold raw 13; settle carry later.

5. Settle carry

Step 5: Settle carryKeep ones; carry moves left.raw windows
settled digits
Settle raw 7 | 17 | 8 | 13 into 8793; keep ones and move carry left.