Question

A rectangular floor is 7 yards long and 3 yards wide. what is the area of the floor in square feet? be sure to include the correct unit in your answer.

Answer 1

There are a couple ways to do this, but basically you need to convert the units. 

7 yards x 3 ft/yard = 21 feet 
4 yards x 3 ft/yard = 12 feet 
So the area (in sq. ft) will be: 
21 x 12 
= 252 sq. ft. 

Alternatively, you can figure the area in square *yards* and then multiply by 9 sq. ft per sq. yard. 
7 yards x 4 yards x 9 sq. ft/sq. yard 
= 252 sq. ft.

hope this helps :)