Instruction Active
Understanding Relatively Prime Numbers
Use the lists of factors to answer the question
Factors of 9: 1, 3,9
Factors of 15: 1, 3, 5, 15
Factors of 21:1, 3, 7, 21
Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40
Which pairs of numbers are relatively prime? Check all
that apply.
9 and 15
9 and 40
9 and 21
15 and 21
21 and 40
Ok