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Math Gym
Addition Guide

Addition Level 12: 3d + 2d (ones carry). answer-window addition.

1. Fill hundreds

Step 1: Fill hundreds
raw windows
running strip
Hundreds window: 4 + 0 = 4. Hold 4; wait for carry from the next window.

2. Fill tens

Step 2: Fill tens
raw windows
running strip
Tens window: 3 + 2 = 5. Hold 5; wait for carry from the next window.

3. Fill ones

Step 3: Fill ones
raw windows
running strip
Ones window: 8 + 7 = 15. Hold raw 15; settle carry later.

4. Settle carry

Step 4: Settle carryKeep ones; carry moves left.raw windows
settled digits
Settle raw 4 | 5 | 15 into 465; keep ones and move carry left.