How to find all the factors of a given number - 4th grade math

I explain a systematic way of finding all the factors of a given number. Basically, we check whether numbers 2, 3, 4, 5, and so on are factors of the number, and every time we find a factor, we write the multiplication and write down both factors. Going through the counting numbers in order, at some point you will know that you will have found all the factors, because the large factors will "meet" the small factors. It's much easier to understand by an example so please watch the video.

This topic is first encountered in 4th grade math (in Common Core) but may be in some other grade/year in other countries/standards.

See also

Find all the factors of a given number — online practice

Introduction to prime numbers — video lesson

Math Mammoth Division 2 — a workbook with worksheets and lessons for long division, remainder, factors, and primes

Math Mammoth Grade 4 curriculum

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