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Maylandsea Primary School

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Year 3 - WALT: compare mass

Year 4 - WALT: convert between different units of measure


When looking at length, we have seen how to convert between millimetres, centimetres, metres and kilometres. If you can remember, the following is used to convert between the units:

10 mms = 1 cm

100 cms = 1 m

1000 ms = 1km

The larger the number, the smaller the unit.  This is why being able to multiply and divide by 10, 100 and 1000 is so important.


When comparing mass, the measurements used are grams and kilograms.  We will need to use what we already know with multiplying and dividing.  Looking back at the conversion of lengths above, how many grams do you think there are in a kilogram?  What length measurement do you think is similar to kilogram?  That's correct!  Kilogram and kilometre are similar as 'kilo' means 1000.  This means that:

1000 grams = 1 kilogram.


For what type of activity could we use mass for?  How can we measure the mass of an item?  Watch the following BBC clip:, look at the examples and complete the 2 activities.