For this activity, and indeed for all your maths work way into the future(!), it will be useful to remember the following facts:
100 centimetres (cm) = 1 metre (m)
1,000 metres (m) = 1 kilometre (km)
1,000 grams (g) = 1 kilogram (kg)
1,000 millilitres (ml) = 1 litre (l)
Looking at those facts above, can you guess what the prefix 'kilo' means?
It means 1,000 which makes it easier to remember some of these measurements.
Right then, let's get started and see how we get on!