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...Nts mental math part ou measurement y c estimation ac the following key understandings underpin students abilities to directly measure objects giving them skills decide what needs be measured by selecting er attributes and units use m for ku we can compare things how measurements of continuous u much a particular attribute each quantities are always approximate number has different may result in made more n orders accurate choosing smaller there special words subdividing other strategies phrases that help us describe our choice unit quantity depends upon trying something means why say standard it interpret communicate calculate working out many baseball bat takes match thing relationships between approximately instrument choose metric system represent should relate well judge size move do calculations easy repeat government western australia p reproduced under terms creative commons attribution international licence related these additional basis making sensible direct indirect estimat...