When will she have both activities again on the same day?

Question

Olivia has piano lessons every 8 days. She also has dance class every 10 days. She has both activities scheduled for today after school.

Answer 1

The GCF of 8 and 10:

8:  2 * 2 * 2

10:  2 * 5

To be able to make 8 or 10 you have to have:  2, 2, 2, and 5.

The GCF is 2 * 2 * 2 * 5 = 40

She will have both activities again in 40 days.

Comments

I stand corrected.  Got them switched.