# 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.

**Math Lessons menu**