Remember there are 3ft in a yard and 12in. in a foot.
To convert 5.5ft to yd, divide by 3.
To convert 2.5yd to ft, multiply by 3 to get 7.5ft.
To convert 7.5 ft to in, multiply by 12.
Just remember when converting to a larger quantity (yards, for example) to a small (feet, for example), you multiply, and from smaller quantity to larger, divide.