Use the fact that 1 inch equals about 2.54 centimeters.
12.7
Practice makes perfect
We want to express 5 inches in centimeters.
5 in.≈ cm
We can do this by using the fact that 1 inch equals about 2.54 centimeters. Let's write this relationship as a unit ratio.
2.54 cm/1in.
To perform the conversion, we need to multiply 5 inches by the unit ratio or its reciprocal. Remember, we want to get the length in centimeters, and every unit we do not want has to be divided out.
We found that 5 inches is equal to about 12.7 centimeters. We can now complete the given statement.
5 in.≈ 12.7 cm
Extra
Common Conversion Factors
The following tool can be used to help you explore some of the most commonly used conversion factors. Conversions can be made both within or between the Metric System and the Imperial System — which is also known as the U.S. Customary System.
Around the world, people use conversion factors on a regular basis. You can read more about some practical applications of conversion factors in our original content.
