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Multiplication

Level 19 / build-up

3d x 3d (mixed)

6 visual steps / multi-digit window train

1. Left Edge

1. Left Edge
 raw windows
5x4 = 20. Carry waits for settle.

5x4 = 20. Carry waits for settle.

2. Left Cross

2. Left Cross
 raw windows
5x2 + 6x4 = 34. Carry waits for settle.

5x2 + 6x4 = 34. Carry waits for settle.

3. Center Stack

3. Center Stack
 raw windows
5x6 + 6x2 + 3x4 = 54. Carry waits for settle.

5x6 + 6x2 + 3x4 = 54. Carry waits for settle.

4. Right Cross

4. Right Cross
 raw windows
6x6 + 3x2 = 42. Carry waits for settle.

6x6 + 3x2 = 42. Carry waits for settle.

5. Right Edge

5. Right Edge
 raw windows
3x6 = 18. Carry waits for settle.

3x6 = 18. Carry waits for settle.

6. Settle strip

6. Settle strip
Settle onceRaw windows keep ones; extra carry moves left.raw windows
settled strip
20 | 34 | 54 | 42 | 18 -> 239838.

20 | 34 | 54 | 42 | 18 -> 239838.

Practice Level 19

A few quick rounds make the train automatic; each raw window keeps one digit.

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