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Multiplication

Level 25 / mastery

3d x 3d (mastery)

6 visual steps / multi-digit window train

1. Left Edge

1. Left Edge
 raw windows
9x8 = 72. Carry waits for settle.

9x8 = 72. Carry waits for settle.

2. Left Cross

2. Left Cross
 raw windows
9x7 + 8x8 = 127. Carry waits for settle.

9x7 + 8x8 = 127. Carry waits for settle.

3. Center Stack

3. Center Stack
 raw windows
9x6 + 8x7 + 7x8 = 166. Carry waits for settle.

9x6 + 8x7 + 7x8 = 166. Carry waits for settle.

4. Right Cross

4. Right Cross
 raw windows
8x6 + 7x7 = 97. Carry waits for settle.

8x6 + 7x7 = 97. Carry waits for settle.

5. Right Edge

5. Right Edge
 raw windows
7x6 = 42. Carry waits for settle.

7x6 = 42. Carry waits for settle.

6. Settle strip

6. Settle strip
Settle onceRaw windows keep ones; extra carry moves left.raw windows
settled strip
72 | 127 | 166 | 97 | 42 -> 864612.

72 | 127 | 166 | 97 | 42 -> 864612.

Practice Level 25

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

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