Cole has 8 pieces of string that are 5 yards each. He uses 4 pieces that are each 5 feet long. How many feet of string does Cole have left?

100 feetTo find the total length of the entire string you multiply 8 times 5 and get 40. To convert into feet multiply by 3 and get 120 feet. To find the total amount of string he uses, multiply 4 times 5 and get 20. It is already in feet. Next you subtract 120 — 20 and get 100 feet, the total amount of string he has left.