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Speed Math by Gaurav Tekriwal

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CHAPTER8

Percentages

In This Chapter

  • Converting percentages into fractions and vice versa
  • Changing percentages into decimal numbers
  • Finding the percentage of a given quantity
  • Getting approximate percentages
  • Increasing or decreasing a quantity by a certain percentage

A percentage is a number or ratio expressed as a fraction of 100. And as you probably know, percentages are denoted by the percent sign: %. Percentages are generally used to express how big or small one quantity is when comparing it with another percentage. You probably deal with them frequently in your daily life, so why not make it easier?

In this chapter, you learn how to work ...

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