Transcription of Wastewater Treatment Facility Operator’s Math
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Wastewater Treatment Facility Operator’s Math
85 14 Published by theMinnesota Pollution Control AgencyTraining and Certification Unit520 Lafayette Road NorthSt. Paul, Minnesota 2008 Wastewater Treatment Facility Operator s MathContentsMath Workbook for Wastewater OperatorsContributors:Steve DuerreGene EricksonDave GustafsonDavid LaneDwayne NelsonSeptember 2008 Edition Revised by Nancy Ellefsonwq-wwtp8-023 2008, State of Minnesota, Minnesota Pollution Control AgencyAll rights of ContentsPreface ..5 Notes:_____ ..6 math Concepts Review ..7 Introduction ..7 Fractions, Decimals ..7 Ratios, Comparing Ratios, Proportion ..8 Percent, Relationship Between Ratios, Fractions, Decimals, Percents, Exponents ..9 Converting Units ..10 Significant Figures ..11 Losing Significant Figures ..12 Rounding Off Numbers ..12 Conversion Examples ..13 Rearranging a Formula ..14 Formula Examples.
A percent is a ratio whose second term is 100. Percent means “out of 100” or “parts per hundred. We can use the percent symbol (%) as a handy way to write a fraction whose denominator is 100. For example, instead of saying “27 out of every 100 professional volleyball players are female,” we can say “27% of professional
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