Skip to content
Math Gym
Addition Guide

Addition Level 29: 4d + 4d (any). large answer-window addition.

1. Fill thousands

Step 1: Fill thousands
raw windows
running strip
Thousands window: 6 + 8 = 14. Hold raw 14; carry settles later.

2. Fill hundreds

Step 2: Fill hundreds
raw windows
running strip
Hundreds window: 2 + 4 = 6. Hold 6; wait for carry from the next window.

3. Fill tens

Step 3: Fill tens
raw windows
running strip
Tens window: 9 + 6 = 15. Hold raw 15; settle carry later.

4. Fill ones

Step 4: Fill ones
raw windows
running strip
Ones window: 7 + 8 = 15. Hold raw 15; settle carry later.

5. Settle carry

Step 5: Settle carryKeep ones; carry moves left.raw windows
settled digits
Settle raw 14 | 6 | 15 | 15 into 14765; keep ones and move carry left.