The total length of Sally's material is

(1 yd 2 ft 6 in) + (2 yd 1 ft 5 in) + (4 yd 2 ft 8 in)

= (1+2+4) yd + (2 + 1 + 2) ft + (6 + 5 + 8 in) (add each of the units separately)

= 7 yd 5 ft 19 in (find the total)

= 7 yd 6 ft 7 in (convert 19 in to 1 ft 7 in)

(1 yd 2 ft 6 in) + (2 yd 1 ft 5 in) + (4 yd 2 ft 8 in)

= (1+2+4) yd + (2 + 1 + 2) ft + (6 + 5 + 8 in) (add each of the units separately)

= 7 yd 5 ft 19 in (find the total)

= 7 yd 6 ft 7 in (convert 19 in to 1 ft 7 in)

**= 9 yd 7 in**(convert 6 ft to 2 yd)