Mass is a measure of how heavy something is. Scales can be used to measure mass.
Mass is measured in grams (g), kilograms (kg) and tonnes. These are known as metric units of mass.
1 kg = 1000 g
1 tonne = 1000 kg
Remember when estimating mass:
100g is about the mass of a small apple.
1 kg is the mass of a bag of sugar or a litre of water.
Ounces and pounds are old units of mass. These are known as imperial units but are not now commonly used in maths.
There are 16 ounces in a pound.
An ounce is roughly equal to 25 grams.
A pound (454g) is equal to just under half a kilogram (500 g).
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