If 8 pigs can fit in a pen, how many pens are necessary to make sure 71 pigs are all in a pen?

9

Step-by-step explanation:

Each pen can only hold 8 pigs, and pens cannot be split up into fractions.

Divide. 71 / 8 = 8.875

There is no 7/8 of a pen, so you must round up.

8.875 → 9.