Which one is not equal to 100 meters?

a.) 0.100 kilometers
b.) 10 hectometers
c.) 10,000 centimeters
d.) 100,000 millimeters

Convert the choices to a common unit and in this item, it is best to convert the choices to meters by dimensional analysis and proper conversion factor.

A. (0.100 km) x (1000 m / 1 km) = 100 m
B. (10 hm) x (100 m / 1 hm) = 1000 m
C. (10,000 cm) x (1 m / 100 cm) = 100 m
D. (100,000 mm) x (1 m / 1000 m) = 100 m
From the obtained values above, the answer to this item is letter B. 

What's the denominator