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Multiplication

Level 21 / mastery

3d x 3d (medium all)

6 visual steps / multi-digit window train

1. Left Edge

1. Left Edge
 raw windows
4x4 = 16. Carry waits for settle.

4x4 = 16. Carry waits for settle.

2. Left Cross

2. Left Cross
 raw windows
4x5 + 5x4 = 40. Carry waits for settle.

4x5 + 5x4 = 40. Carry waits for settle.

3. Center Stack

3. Center Stack
 raw windows
4x6 + 5x5 + 6x4 = 73. Carry waits for settle.

4x6 + 5x5 + 6x4 = 73. Carry waits for settle.

4. Right Cross

4. Right Cross
 raw windows
5x6 + 6x5 = 60. Carry waits for settle.

5x6 + 6x5 = 60. Carry waits for settle.

5. Right Edge

5. Right Edge
 raw windows
6x6 = 36. Carry waits for settle.

6x6 = 36. Carry waits for settle.

6. Settle strip

6. Settle strip
Settle onceRaw windows keep ones; extra carry moves left.raw windows
settled strip
16 | 40 | 73 | 60 | 36 -> 207936.

16 | 40 | 73 | 60 | 36 -> 207936.

Practice Level 21

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

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