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Multiplication

Level 8 / realistic untimed

2d x 2d (medium digits)

4 visual steps / 2x2 window scan

1. Left edge

1. Left edge
raw windows
Start with the leftmost window.

Start with the leftmost window.

2. Cross window

2. Cross window
raw windows
Add both crossing products.

Add both crossing products.

3. Right edge

3. Right edge
raw windows
Finish the ones product.

Finish the ones product.

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 8

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

Start Level