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.
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
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.