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The partial products algorithm - video lesson

This video lesson for 4th grade explains the partial products algorithm (multiplying in parts). For example, 7 x 534 is done as 7 x 500, 7 x 30, and 7 x 4, and lastly those parts are added.

The regular multiplication algorithm is based on this concept, so that is why I feel it is important to show this to the students. It can be a stepping stone to the regular algorithm, but it has value in itself as it shows the principle of how to multiply multi-digit numbers.



See also:

Partial products - a complete lesson, taken from my book Multiplication 2.

Worksheet for partial products: single-digit number times a 2-digit number
Worksheet for partial products: single-digit number times a 3-digit number
Worksheet for partial products: single-digit number times a 4-digit number


Math Mammoth Multiplication 2

A self-teaching worktext for 4th grade that covers multiplying by whole tens and hundreds, multi-digit multiplication in columns, order of operations, word problems, scales problems, and money problems.

Download ($5.10). Also available as a printed copy.

Learn more and see the free samples!

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Practice makes perfect. Practice math at IXL.com



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