As well as understanding how many metres there are in a kilometre, or how many grams there are in a kilogram, children are also expected to be able to convert from different metric units i.e. How many millilitres in 3.4 litres, how many millimetres in 23.7 centimetres etc.
In order to convert from one metric unit to another children first have to be able to multiply and divide by 10, 100 and 1000, and then remember which calculation they are actually going to perform.
The basic rule for multiplying by 10, 100 and 1000 is that all the digits in the number move 1, 2, or 3 columns to the left respectively, and to the right when dividing, so:
2.34 x 10 = 23.4, 34.5 x 100 = 3450, 6.73 x 1000 = 6730
So that the children can remember which of these calculations to do when converting from the different units, I have prepared a sheet below, which can be downloaded, including flowcharts showing which calculations they have to perform. Under the flowcharts are a number of questions for them to answer. I have also included another sheet which has the digits removed so that you can put your own digits in, if you wish to have extra practise.