Summary
The divisibility rules -- quick tests for whether a number divides evenly by 2, 3, 4, 5, and more. Mr. J explains the rule and why it works.
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All ages
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Teaching resources
Discussion questions
Divisibility rules are shortcuts that tell you if one number divides another with no remainder.
- How can you tell if a number is divisible by 2? By 5?
- What is the rule for divisibility by 3?
- How do divisibility rules speed up finding factors?
Quick work-a-long
Words to know: divisible, factor, remainder, rule
- Test whether 96 is divisible by 3 and by 4.
- List which of 2, 3, 5, and 10 divide 120 evenly.