How do you get the square footage of a room when the room is 13 feet wide and 19 feet 7 inch long?

Convert the seven (7) inches into a decimal (12 inches = one foot)

7 inches divided by 12 inches = .583 inches

Now multiply the length times the width..

13 feet x 19.583 = 254.58 square feet

If you want to know how many yards are in this area, divide this by 9 (there are 9 square feet in a yard)

254.58 divided by 9 = 28.29 square yards