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The Metric System
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The Metric System

lesson introduction

The Metric System

The Metric System is a system of units of measurement, which is used all over the world.

There are two different systems for measuring length, mass and capacity

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First of all, what do we mean by length?

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What do we mean by mass?

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And what do we mean by capacity?

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So there are two systems for measuring length, mass and capacity

The metric system The imperial system

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The metric system uses units like...

metres, kilometres, grams, kilograms, litres, millilitres etc.

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The imperial system uses units like...

yards, miles, pounds, stone, gallons etc.

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True or false? Most countries in the world use the imperial system.

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True or false? Both the metric system and the imperial system are widely used in the UK and in the US.

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This lesson will focus on the metric system

Most countries in the world use the metric system (although the imperial system is also widely used in the UK and in the US).

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How many metres are in a kilometre?

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How many grams are in a kilogram?

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What do you think "kilo" means?

A) Metre B) Gram C) 1,0001,000

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"Kilo" means 1,0001,000

There are 1,000 m1,000 \space m in a kilometre. There are 1,000 g1,000 \space g in a kilogram.

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How many metres are there in 3 kilometres?

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How many grams are there in 4.5 kilograms?

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How many kilometres is 14,000 m14,000 \space m?

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Now, how many millimetres are in a metre?

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How many millilitres are in a litre?

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What do you think "milli" means?

A) 1,0001,000 B) 1,000th1,000th

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"Milli" means 1,000th1,000th or 11,000\frac{1}{1,000}

1 millimetre is 1,000th1,000th of a metre or 11,000m\frac{1}{1,000}m 1 millilitre is 1,000th1,000th of a litre or 11,000l\frac{1}{1,000}l

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How many millilitres are there in 5.6 litres?

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How many metres are 8,500 mm8,500 \space mm?

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How many millimetres are in a centimetre?

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So there are 10 mm10 \space mm in a centimetre. How many centimetres are in a metre, then?

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What does "centi" mean then?

A) 100100 B) 100th100th

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How many centilitres are in a litre?

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"Centi" means 100th100th or 1100\frac{1}{100}

1 centimetre is 1100m\frac{1}{100}m 1 centilitre is 1100l\frac{1}{100}l

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How many centimetres are there in 4 metres?

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Summary! So the metric system is built up around basic units

Metres, grams and litres

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"Kilo" means 1,0001,000

1 kilometre is 1,000 m1,000 \space m 1 kilogram is 1,000 g1,000 \space g

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"Milli" means 1,000th1,000th

1 millimetre is 11,000m\frac{1}{1,000}m 1 millilitre is 11,000l\frac{1}{1,000}l

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"Centi" means 100th100th

1 centimetre is 1100m\frac{1}{100}m 1 centilitre is 1100l\frac{1}{100}l

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Actually there are many more units in the metric system

They all relate to metres, grams and litres as basic units though.

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