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Unformatted text preview: (b) the unit of that time to minutes and correct the answer to 2 significant figures. 4. A blackboard of dimensions 3.8m × 1.2m is to be covered by sheet of paper each of dimensions 205mm × 450mm. (a) Estimate the area of a sheet of paper by first rounding off each dimension correct to 3 significant figures and give your answer in m 2 . (b) Estimate how many sheets of paper are needed to cover the whole blackboard....
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- Winter '11