NAME ______________________________ DATE _______________
HOMEWORK
Determine whether each number is prime or composite. Explain how you know.
1 Is 21 prime or composite? How do you know?
2 Is 39 prime or composite? How do you know?
3 Is 55 prime or composite? How do you know?
4 Is 63 prime or composite? How do you know?
5 Is 87 prime or composite? How do you know?
NOTE
Students identify numbers less than 100 as either prime or composite and explain how they know.
MWI Prime and Composite Numbers