The average 10 year old boy is 55 inches tall. How tall is this, in feet?

There is 12 inches in a foot. Times inches by feet. You can pick a number for the feet and do trial and error until you get a number the closet to 55.

12 inches times 4 feet equals 48 inches.

12x4 = 48

Now subtract 55 inches from 48 inches

55-48 = 7 inches

So 4 feet and 7 inches tall