Learn to find the factors of the number 21. The number 21 is a composite number, as a result, it is divisible by numbers other than itself and 1.
The factors of 21 are 1,3,7,21
The prime factors are 3 and 7
There are shortcuts that help you determine if a number is divisible by another. For example, if a number ends in zero or is even then it is divisible by 2. You can download this chart to learn these rules.
Divisibility Rules Chart
http://www.moomoomathblog.com/2019/03/divisibility-rules.html
Finding factors playlist
https://www.youtube.com/watch?v=0NvLtTwnUHs&list=PLurjkZV1ykGZ2SvB_MccSr2y-asFcCk-u
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