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Addition

Level 14 / build-up

3d + 2d (any)

4 visual steps / answer-window addition

1. Fill hundreds

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

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

2. Fill tens

Step 2: Fill tens
raw windows
running strip
Tens window: 2 + 7 = 9. Hold 9; wait for carry from the next window.

Tens window: 2 + 7 = 9. Hold 9; wait for carry from the next window.

3. Fill ones

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

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

4. Settle carry

Step 4: Settle carry
Settle onceKeep ones; carry moves left.raw windows
settled digits
Settle raw 6 | 9 | 13 into 703; keep ones and move carry left.

Settle raw 6 | 9 | 13 into 703; keep ones and move carry left.

Practice Level 14

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

Start Level