# Conversions and Units

When we have the prefix (before a word) kilo it means 1000

1 kilogram = 1000 grams

1 kilometre = 1000 metres

When we have the prefix (before a word) milli it means 11000

1000 millimetres = 1 metre

1000 millilitres = 1 litre

When we have the prefix centi it means 1100

100 centimetres = 1 metre

Try these:

Here is a conversion graph that can be used to change between Euros and Pounds. We can use the conversion graph to convert Euros into Pounds or Pounds into Euros.

Example: Use the conversion graph to convert €10 into Pounds.

We need to draw a straight line up (vertical) from €10 to the line on the conversion graph. We then draw a horizontal line (across) from this point to the Pounds axis. We now read off the scale. Half way between £8 and £9 is £8.50

€10 = £8.50

Example: Use the conversion graph to convert £18 into Euros.

We need to draw a straight line across (horizontal) from £18 to the line on the conversion graph. From this point we draw a vertical line down to the Euros axis We can now read off the Euros axis.
£18 = €21

We can also be asked to use a conversion graph to convert numbers that are off the chart

Example: Use the conversion graph to convert €80 into Pounds.

The first step would be to use the conversion graph to convert something in Euros into Pounds

If we convert €20 into pounds we could multiply the answer by 4 to get €80 €20 is just over £17
In an exam question there will be a range of answers, anything between £17 and £17.25 should be acceptable.
I will say €20 = £17.10

We can now multiply by 4
4 × €20 = 4 × £17.10
€80 = £68.40