Carl has three lengths of cable. 5/6 yard long, 1/4 yard long, and 2/3 yard long. He needs at least 1 yard of cable. After Carl has used 1 yard of cable, how much cable will he have left? Explain how you found your answer.

So this wants you to add the fractions and subtract 1/1

we know that 6/8=3/4 because 3/4 times 2/2 (or 1) os 6/8

so we need the denomenators (bottom number) to be the same

so 5/6=10/12

1/4=3/12

2/3=8/12

add them together

10+3+8=21

21/12=1 and 9/12

subtract 1 and get

9/12 left or 3/4 yard left