An art teacher buys 9 bags of cotton balls. There are 68 cotton balls in each bag.

Which expression is best to estimate the number of cotton balls the teacher

buys?

9+70

9*60

9*70

9+60

9*70

Step-by-step explanation:

It is not 9+70 or 9+60 because for this problem multiplication is required.

This problem seems to want you to round to the nearest ten's place. Because the one's place in 68 is above 5, the number will round up.

This means that the answer will be 9*70