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Multiplication

Level 12 / build-up

3d x 1d (tens carry)

4 visual steps / multi-digit window train

1. Left edge

1. Left edge
raw windows
Start with the leftmost digit pair.

Start with the leftmost digit pair.

2. Slide windows

2. Slide windows
raw windows
Move one window at a time.

Move one window at a time.

3. Raw strip

3. Raw strip
raw windows
Hold the raw totals in order.

Hold the raw totals in order.

4. Settle strip

4. Settle strip
Settle onceRaw windows keep ones; extra carry moves left.raw windows
settled strip
Keep 1s; extra carry moves left.

Keep 1s; extra carry moves left.

Practice Level 12

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

Start Level