In maths, measurements are the means by which we can tell how much of an item is present. Measurements are used to give us numeric values for length, width, height, weight, time, volume and so on.

Examples: A stick is 50 cms long, a bag weighs 30 Kilograms, a bottle may contain 100 ml of water and so on. Here cms, kilograms and ml are all units of measurement,.

**Did you know?**

There are two measurement systems that are in use. These are referred to as English and Metric measurement systems. The Metric system is popular across the world while the English system is used mainly in the US.

**Conversion**

Conversion of units is the conversion between different measurement units for the same quantity of the item using conversion factors.

**For example: **

Length can be expressed in centimeters, meters, kilometers and so on. 200 centimeters can also be expressed as 2 meters. This is a metric system conversion of the units. There is usually one base measurement unit for each category and other units can then be converted from this base unit. So in case of length we have meter as the base unit and we know that 100 centimeters = 1 meter. In this case 100 is also known as the conversion factor. Longer distances are usually expressed in Kilometers.

Let us take a look at some common measurement units and their conversion factors for the most common categories such as distance, weight and volume.

**Distance**

Meter (m) |
Base unit |

Millimeter (mm) |
1000 mm = 1 m |

Centimeter (cm) |
100 cm = 1 m |

Kilometer (km) |
1000 m = 1 km |

**Weight**

Grams (g) |
Base unit |

Milligrams (mg) |
1000 mg = 1 g |

Kilograms (kg) |
1000 g = 1 kg |

**Volume**

Liters (L) |
Base unit |

Milliliters (mL) |
1000 mL = 1 L |

**Conversion formula:**

How do you know if you should multiply or divide while converting between units? Follow these simple rules

If you are converting from a larger unit to a smaller unit, then you should use multiplication.

If you are converting from a smaller unit to a larger unit, then you should use division.

**Examples:**

Question: Convert 5 kilograms into grams.

(Answer: To convert from a bigger to a smaller unit, we should use multiplication. Hence

1 kilogram = 1000 grams, 5 kilograms = 5 * 1000 = 5000 grams)

Question: Convert 4400 grams into Kilograms.

(Answer: To convert from smaller to a bigger unit, we should use division. Hence

4400 grams/ 1000 = 4.4 Kilograms

)

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