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If you read in the Saturday sports section of the paper that the attendance at a football match was exactly 43,786 and a friend asked you about the attendance at school on Monday, you would probably say about 44,000. In this case you are giving an approximate answer to 2 S.f. Significant Figures It is often necessary/convenient/sensible to give approximations to real life situations or as answers to certain calculations.

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Significant Figures (Rounding) Numbers can be rounded to 1,2, 3 or more significant figures. We count the number of figures from the first non-zero digit. Rounding to 1 s.f 5 or bigger ? or bigger ? or bigger ? 0.04 NoYes No First non-zero digit.

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Rounding to 1 s.f or bigger ? or bigger ? Yes First non-zero digit. Significant Figures (Rounding)

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or bigger ? or bigger ? Yes First non-zero digit. Significant Figures (Rounding) Rounding to 2 s.f

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or bigger ? or bigger ? Yes No First non-zero digit. Significant Figures (Rounding) Rounding to 2 s.f

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or bigger ? or bigger ? Yes First non-zero digit. Significant Figures (Rounding) Rounding to 3 s.f

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or bigger ? or bigger ? No Yes First non-zero digit. Significant Figures (Rounding) Rounding to 4 s.f

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Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number. Rounding whole numbers to 1 s.f or bigger ? No or bigger ? No or bigger ? Yes

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Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number Rounding whole numbers to 1 s.f or bigger ? 200 No or bigger ? 600 Yes or bigger ? 80 Yes

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Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number Rounding whole numbers to 2 s.f or bigger ? Yes or bigger ? Yes or bigger ? No

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Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number Rounding whole numbers to 2 s.f or bigger ? 240 No or bigger ? 290 Yes or bigger ? 760 Yes

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Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number Rounding whole numbers to 3 s.f or bigger ? No or bigger ? Yes or bigger ? Yes

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Significant Figures (Rounding) When we approximate whole numbers we may need to insert zeros as required in order to maintain the size of the number Rounding whole numbers to 4 s.f or bigger ? No or bigger ? Yes or bigger ? Yes

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The following number could be the population of a country at a particular instant in time.Write this number to 1, 2, 3, 4, 5, 6 and 7 significant figures

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