What is the GCF of 45 and 6?
45: 3 * 3 * 5
6: 2 * 3
The GCF is made by multiplying together the list of prime numbers needed to make 45 and 6.
We need 2, 3, 3, and 5 to make 45 or 6, so the GCF is 2 * 3 * 3 * 5 = 90
She will have both activities 90 days after this Sunday.