Multiply and divide in parts - mental math, area model, 2-digit by 2-digit

Learn how to use partial products to multiply numbers such as 7 × 84 or 4 × 321 with mental math. We also use subtraction — such as with 6 × 99!

In the second part of the lesson, we focus on the area of a two-part rectangle, which gives us a simple visual model to illustrate partial products (the distributive property), here called "multiplying in parts".

In the third part, I show how to solve a 2-digit by 2-digit multiplication problem with the partial products algorithm.

Lastly, did you know we can also divide in parts?

See also

The distributive property — introduction (video lesson)

Expressions – What are expressions and how to evaluate them

Math Mammoth Grade 6 curriculum

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