Stage: 1 Challenge Level: 
Can you use your fingers to show how long 18mm is approximately? Which thing is about this length on the list?
How tall are you? How much do you weigh?
Practical Activity. Compound transformations. Interactivities. Visualising. Estimating and approximating. Mass and weight. Length/distance. Tangram. Games. Working systematically.
Published October 2004.
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