Question

1. Iris has two ribbons. The first ribbon is 11.7 in. long. The second ribbon is 5.25 in. long. She wants to cut them so that they are the same length.

what is the answer
(a) Estimate the difference between the ribbon lengths.
(b) Will your estimate be high or low? Explain.
(c) How much does Iris need to cut from the longer ribbon to make the ribbons the same length?

Answer 1

The estimated lengths are 12in. and 5 in. This would be an estimated difference of 7in.


The estimated difference is going to be higher than the actual difference because in rounding 11.7 to 12, you are losing .30in, but in rounding down 5.25 to 5, you are actually gaining .75in.


The ACTUAL difference is 6.45in