Converting between metric units is always about multiplying or dividing by 10, 100 or 1000. There is a link to it on the "Start" page of this module.

**Example 1: cm to mm**

A piece of wood is 6 cm long, How many is that?

Each has 10mm. So 6 cm will have 10 x 6 = 60 mm.

**Example 2: kg to g**

A box weighs 1.25 kg. How many grammes is that?

A kg has 1 000 g. So multiply by 1 000

1.25 x 1 000 = 1 250 grammes.

**1 000 mm = 100 cm = 1 m**

**1 000 ml = 1 litre**

**1 000 grammes = 1 kg**

**Example 3: ml to litres**

A plastic container holds 2 500 ml of liquid. What is it n litres?

You have to go from small units (**ml**) to large ones (**litres**). The nimber of litres will be **less** **than** the number of ml. So it must be a **divide** sum.

There are 1 000 ml in 1 litre, so divide by 1 000

2 500 / 1 000 = 2.5 litres.

**Example 4: cm to m**

Jackie is 178 cm tall. What is in m?

You are going from a smaller unit (**cm**) to a larger one (**meters**). The number of meters will be **less than** the number of cm. So it must be a divide sum.

There are 100 cm in 1 m, so divide by 100

178 / 100 = 1.78 m.

**Abbreviation Full Follow**

Length mm Millimetre

cm Centimetre

m Metre

km Kilometre

Weight g Grams

kg Kilograms

Capacity ml Mililitre

l Litre

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