An introduction to the measurement of large things. 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.

First broadcast:
11 September 2007

This clip can be used as a stimulus for pupils to think about how much great objects weigh and how long they are, particularly those which are very difficult or impossible to measure. Pupils can be asked to write a short list of some such objects and, based on the dimensions of the whale and the length of the classroom (which they can measure in groups), estimate how long and heavy their chosen objects are. This will help pupils to become familiar with scale and able to more confidently and realistically estimate weights and lengths.