Oldest
Divisibility tests for 2, 3, 4, 5, 6, 9, 10
Worked example of basic divisibility tests
Khan Academy
Divisibility tests
423
06:32
The why of the 3 divisibility rule
Why you can add the digits to see if something is divisible by 3
Khan Academy
Divisibility tests
578
05:01
The why of the 9 divisibility rule
Why you can test divisibility by 9 by just adding the digits
Khan Academy
Divisibility tests
471
05:07
