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Multiplication

Level 16 / build-up

3d x 3d (minimal carry)

6 visual steps / multi-digit window train

1. Left Edge

1. Left Edge
 raw windows
2x1 = 2. Raw fits.

2x1 = 2. Raw fits.

2. Left Cross

2. Left Cross
 raw windows
2x2 + 1x1 = 5. Raw fits.

2x2 + 1x1 = 5. Raw fits.

3. Center Stack

3. Center Stack
 raw windows
2x1 + 1x2 + 3x1 = 7. Raw fits.

2x1 + 1x2 + 3x1 = 7. Raw fits.

4. Right Cross

4. Right Cross
 raw windows
1x1 + 3x2 = 7. Raw fits.

1x1 + 3x2 = 7. Raw fits.

5. Right Edge

5. Right Edge
 raw windows
3x1 = 3. Raw fits.

3x1 = 3. Raw fits.

6. Read answer

6. Read answer
Read answerRaw windows read left to right.raw windows
answer strip
Read 2 | 5 | 7 | 7 | 3 as 25773.

Read 2 | 5 | 7 | 7 | 3 as 25773.

Practice Level 16

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

Start Level