Question

a board is 90 inches long. how long is it in feet and inches?

Explanation:

Step1: Recall feet-inch conversion

1 foot = 12 inches

Step2: Divide total inches by 12

$\frac{80}{12} = 6$ with a remainder of $8$
(This means 6 full feet, with 8 inches left over)

Answer:

6 ft 8 in