# Long multiplication

Multiply a whole number of up to four digits by a one-digit number, and multiply two two-digit numbers, using formal written methods including long multiplication; illustrate with area models

Builds on: Written Multiplication (hard, https://ai.page/c/written-multiplication/en.md), Area and the distributive property (soft, https://ai.page/c/area-and-the-distributive-property/en.md)

Concept id: long-multiplication. Subject: maths. Licence: CC BY-SA 4.0.

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