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Addition

Level 13 / realistic untimed

3d + 2d (both carry)

4 visual steps / 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.

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: 7 + 5 = 12. Hold raw 12; settle carry later.

Tens window: 7 + 5 = 12. Hold raw 12; settle carry later.

3. Fill ones

Step 3: Fill ones
raw windows
running strip
Ones window: 8 + 6 = 14. Hold raw 14; settle carry later.

Ones window: 8 + 6 = 14. Hold raw 14; settle carry later.

4. Settle carry

Step 4: Settle carry
Settle onceKeep ones; carry moves left.raw windows
settled digits
Settle raw 4 | 12 | 14 into 534; keep ones and move carry left.

Settle raw 4 | 12 | 14 into 534; keep ones and move carry left.

Practice Level 13

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

Start Level