John has three pieces of rope. One piece was 31 cm long, one piece was 0.33 m long, and one piece was 0.45 m long. John wants to know how much rope he has. Which statement best describes how John should figure out the amount of rope he has?
The best statement would be to to put them all into centimetres by multiplying the meters by 100 and then add them all up and this will give you how much rope John has.