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.
Millimeter (abbreviation: mm): is a unit of length in the SI metric system, equal to one thousandth of a metre. Therefore, there are thousand millimetres in a metre and ten millimetres in a centimetre.
How to Convert Kilometers to Millimeters
Example: How many millimeters are equivalent to 51.43 kilometers?
As;
1 kilometers = 1000000 millimeters
51.43 kilometers = Y millimeters
Assuming Y is the answer, and by criss-cross principle;
Y equals 51.43 times 1000000 over 1
(i.e.) Y = 51.43 * 1000000 / 1 = 51430000 millimeters
Answer is: 51430000 millimeters are equivalent to 51.43 kilometers.
Practice Question: Convert the following units into mm:
N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.
( i ) 35.12 km
( ii ) 19.6 km
( iii ) 50.78 km
