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Compare the masses of objects using an equal-arm balance

• Use uniform informal units to measure the mass of an object by counting the number of units needed to obtain a level balance on an equal-arm balance

• Select an appropriate uniform informal unit to measure the mass of an object and justify the choice

• Explain the relationship between the mass of a unit and the number of units needed

• Compare the masses of two or more objects using the same informal units

• Estimate mass by referring to the number and type of uniform informal unit used and check by measuring

• Recognise that mass is conserved