Summary
Sorts numbers into prime (exactly two factors) and composite (more than two) by looking at what divides them evenly. Builds factor thinking.
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Teaching resources
Discussion questions
Talk about it
A prime number can only be made by 1 times itself. A composite number has more factors — it can be split into equal groups more than one way.
- Why is 7 a prime number?
- Name two factors of 12 besides 1 and 12. Is 12 prime or composite?
- Is 1 prime? Why is it a special case?
Quick work-a-long
Vocabulary: prime, composite, factor, divides evenly.
Try it: List the factors of 9 and of 11. Which is prime and which is composite?