If 100 pieces, each 15 centimeters long, are cut from a 51-meter long ribbon, how much ribbon remains ? Let's think first. Chain of thought:
The total length cut from the 51 - meter ribbon is 100 x 15 centimeters = 1500 centimeters. Since 1 meter is equal to 100 centimeters, then 1500 centimeters is equal to 1500 / 100 = 15 meters. Therefore, 51 - 15 = 36 meters of ribbon remains.
Therefore, the answer is 36.