**Definitions:**

**Kilometer** (abbreviation: **km**): is a unit of length in the SI metric system, equal to one thousand metres (kilo- being the prefix for 1000). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world countries.

**Mile** (abbreviation: **mi**): is an English unit of length of distance equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.

## How to Convert Kilometers to Miles

*Example: How many miles are equivalent to 51.28 kilometers?*

As;

1 kilometers = 0.621371 miles

51.28 kilometers = Y miles

Assuming Y is the answer, and by criss-cross principle;

Y equals 51.28 times 0.621371 over 1

(i.e.) Y = 51.28 * 0.621371 / 1 = 31.86390488 miles

Answer is: 31.86390488 miles are equivalent to 51.28 kilometers.

*Practice Question: Convert the following units into mi:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 51.51 km

( ii ) 43.38 km

( iii ) 30.45 km