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Addition

Level 24 / mastery

4d + 3d (any)

5 visual steps / large answer-window addition

1. Fill thousands

Step 1: Fill thousands
raw windows
running strip
Thousands window: 6 + 0 = 6. Hold 6; wait for carry from the next window.

Thousands window: 6 + 0 = 6. Hold 6; wait for carry from the next window.

2. Fill hundreds

Step 2: Fill hundreds
raw windows
running strip
Hundreds window: 2 + 8 = 10. Hold raw 10; settle carry later.

Hundreds window: 2 + 8 = 10. Hold raw 10; settle carry later.

3. Fill tens

Step 3: Fill tens
raw windows
running strip
Tens window: 9 + 4 = 13. Hold raw 13; settle carry later.

Tens window: 9 + 4 = 13. Hold raw 13; settle carry later.

4. Fill ones

Step 4: Fill ones
raw windows
running strip
Ones window: 7 + 6 = 13. Hold raw 13; settle carry later.

Ones window: 7 + 6 = 13. Hold raw 13; settle carry later.

5. Settle carry

Step 5: Settle carry
Settle onceKeep ones; carry moves left.raw windows
settled digits
Settle raw 6 | 10 | 13 | 13 into 7143; keep ones and move carry left.

Settle raw 6 | 10 | 13 | 13 into 7143; keep ones and move carry left.

Practice Level 24

A few quick rounds make digit release automatic; carry is the only thing to keep.

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