centimeters
1 unit cube is equal to centimeter.
Sue had a ribbon that was 15 centimeters long. She cut off 3 centimeters of ribbon. How long is her ribbon now?
15 - 3 = 12
If an object is 5 unit cubes long, it is centimeters long.
5
Mary had 2 ribbons. Each ribbon was 5 centimeters long. How many centimeters of ribbon does Mary have altogether?
5 + 5 = 10
A centimeter is shorter/longer than a meter.
shorter
Mike has a string that is 22 centimeters long. He removes 7 centimeters. How long is his string now?
22 - 7 = 15