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Published byStewart Dean Modified over 9 years ago
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1 EstimationStrategies Press Ctrl-A ©2009 – Not to be sold/Free to use Stage 5 Year 9
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2 End of Slide Level of accuracy - approximation When find the area of a circle the 8 decimal places on the calculator may not be relevant. r = 2.9cm A = r 2 A = x 2.9 2 A Upper = x 3.0 2 A Lower = x 2.8 2 = 26.420794 = 28.274333 = 24.630086 More than 2 significant figures - meaningless. = 26 Use the significant figures in question.
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3 End of Slide Level of accuracy - approximation Find the area of the square. 2.75 m Three significant figures Area = s 2 = 2.75 2 = 7.5625 = 7.56 cm 2
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4 End of Slide Level of accuracy - approximation Find the area of the square. 17.05 m Four significant figures Volume = s 3 = 17.05 3 = 4956.477625 = 4956 cm 3
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