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Measure and compare the internal volumes (capacities) of containers by filling

• Use uniform informal units to measure how much a container will hold by counting the number of times a smaller container can be filled and emptied into the container being measured.

• Select appropriate informal units to measure the capacities of containers.

• Recognise and explain the relationship between the size of a unit and the number of units needed.

• Compare the internal volumes of two or more containers using appropriate uniform informal units.

• Recognise and explain why containers of different shapes may have the same internal volume.

• Estimate how much a container holds by referring to the number and type of uniform informal unit used and check by measuring.

Measure the internal volume (capacity) of containers by packing

• Pack cubic units (eg blocks) into rectangular containers so that there are no gaps.

• Recognise that cubes pack better than other objects in rectangular containers.

• Estimate and measure the internal volume of a container by filling the container with uniform informal units and counting the number of units used.

• Explain that if there are gaps when packing and stacking, this will affect the accuracy of measuring the internal volume.

Construct volumes using cubes

• Explore different rectangular prisms that can be made from a given number of cubes.

• Devise and explain strategies for stacking and counting units to form a rectangular prism.

• Record volumes, referring to the number and type of uniform informal unit used.