3ft and 4in
576 square inches or 4 square feet
4in is less than 1 ft so 4in is a fraction of a foot 4/12 = 1/3 4in = 1/3ft = .33 ft
2 ft 6 in
6ft 4in minus 3ft 8in
There are 100 inches in 8ft 4in
it is not 4in it is 1/4in long
4in
3ft by 4ft
1ft = 12 inches so 3ft = (12 x 3) = 36 inches.
30 inches is 30 inches! 30 / 12 = 2.5 which is 2 feet 6 inches.
it is about 46 inches