The partial products algorithm allows anyone (even students who are "bad" at math) to learn how to multiply 2- and 3-digit numbers! It is also easy to see why it works. You don't have to be a math whiz!
Partial products means that we multiply in part-by-part. For example, 7 x 534 is done as 7 x 500, 7 x 30, and 7 x 4, and lastly those parts are added.
This topic is also explained (along with practice problems) in my book Math Mammoth Multiplication 2 at http://www.mathmammoth.com/multiplication_2.php - available both as an inexpensive download ($5.10) and as a printed copy.
Tagged under: multiplication,4th grade,multiplication algorithm,partial products
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