## Elementary Algebra

The tree frog was 6.5 cm long. To find the length of the frog measured in millimeters, we need to multiply 6.5 by the ratio that converts centimeters to millimeters. The ratio that converts centimeters to millimeters is $\frac{10\ millimeters}{1\ centimeter}$ So: 6.5 centimeters $\times$ $\frac{10\ millimeters}{1\ centimeter}$ = 6.5 $\times$ 10 = 65 millimeters