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Three Significant Figures Three significant figures. If you approximate a number, what are the most significant 3 numbers that you can give. E.g. 0.74341.

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Presentation on theme: "Three Significant Figures Three significant figures. If you approximate a number, what are the most significant 3 numbers that you can give. E.g. 0.74341."— Presentation transcript:

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2 Three Significant Figures Three significant figures. If you approximate a number, what are the most significant 3 numbers that you can give. E.g. 0.74341 88572

3 Rounding Decimals to 3 s.f 0. 8 2 3 4 5 5 or bigger ? 0.823 1 5. 3 6 1 5 or bigger ? 15.4 1 8. 0 3 5 or bigger ? 18.0 1 8. 0 5 5 or bigger ? 18.1

4 Rounding Decimals and Whole Numbers to 3 s.f 0. 3 9 9 8 5 or bigger ? 0.400 1 7. 9 9 5 or bigger ? 18.0 4 2 3. 1 1 5 or bigger ? 423 4 8 8 7 5 or bigger ? 4890 8 9 9 9 9 9 5 or bigger ? 900000

5 Write these numbers to 3 significant figures: 1.3.2441 2.5.03698 3.0.84677 4.0.071233 5.19.03 6.0.29999 7.16.95 8.43,227 9.1,579,800 10.143.2 11.196.5 12. 54,024 Answers 1.3.24 2.5.04 3.0.847 4.0.0712 5.19.0 6.0.300 7.17.0 8.43,200 9.1,580,000 10.143 11.197 12.5.40 x 10 4

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