Introduction Aqa Foundation

Introduction to percentages

What is a percentage?

• “Per-cent” simply means “out of 100” (or “ ÷ 100”)

• Rewriting fractions as percentages means they can be compared more easily

• You can do this by finding an equivalent fraction with a denominator of 100

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  • The three percentages are much easier to compare than the three fractions

• Percentages are also equivalent to decimals

  • <img alt=”table row cell 100 percent sign end cell equals 1 row cell 10 percent sign end cell equals cell 0.1 end cell row cell 1 percent sign end cell equals cell 0.01 end cell row cell 0.1 percent sign end cell equals cell 0.001 end cell end table” data-mathml='<math ><semantics><mtable columnspacing=”0px” columnalign=”right center left”><mtr><mtd><mn>100</mn><mo>%</mo></mtd><mtd><mo>=</mo></mtd><mtd><mn>1</mn></mtd></mtr><mtr><mtd><mn>10</mn><mo>%</mo></mtd><mtd><mo>=</mo></mtd><mtd><mn>0</mn><mo>.</mo><mn>1</mn></mtd></mtr><mtr><mtd><mn>1</mn><mo>%</mo></mtd><mtd><mo>=</mo></mtd><mtd><mn>0</mn><mo>.</mo><mn>01</mn></mtd></mtr><mtr><mtd><mn>0</mn><mo>.</mo><mn>1</mn><mo>%</mo></mtd><mtd><mo>=</mo></mtd><mtd><mn>0</mn><mo>.</mo><mn>001</mn></mtd></mtr></mtable><annotation encoding=”application/vnd.wiris.mtweb-params+json”>{“language”:”en”,”fontFamily”:”Times New Roman”,”fontSize”:”18″,”autoformat”:true}</annotation></semantics></math>’ height=”100″ role=”math” 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