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An introduction to the measurement of large objects such as a blue whale. The length of a blue whale - 30 metres - is equivalent to a class of children or three buses. Whales eat krill. Each mouthful is 40,000 litres. A blue whale is equivalent in weight to 25 elephants and weighs 170,000 kilograms.

Various animals and objects could be presented to the students together with their measurements. Students could then work out the equivalent weight, length or height between them. For example, if a giraffe is 6 metres tall and a penguin is 1 metre tall, 6 penguins stacked on top of one another share the equivalent height of 1 giraffe. Students could have fun with this idea and find their own equivalent objects, animals or people.