Problem of the Week for Upper Elementary

Question: 

Grace is buying a new charger for her phone and wants to know which one has the longer cord: a black charger with a 70-inch cord or a white charger with a 180-centimeter cord. An inch is 2.54 centimeters. 

Which cord is longer? By how much? Give your answer in centimeters. 

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Answer: The white cord is 2.2 centimeters long.

Solution: Since an inch is 2.54 centimeters, that means that 70 inches is 70 x 2.54 = 177.8 centimeters. The white cord is 180 centimeters long, which is 180-177.8=2.2 centimeters longer.