Comparing Numbers with Ratios

Comparing Numbers with Ratios

Introduction to Ratios

Opening

Introduction to Ratios

Look at the picture of stars and triangles and read the following information.

  • One way that you can compare the number of stars and the number of triangles is to say that there are 7 more stars than there are triangles. This comparison looks at the difference between two quantities; it uses the operation of subtraction.
  • Another way that you can compare the number of stars and the number of triangles is to say that for every 3 triangles there are 10 stars. You can say that the ratio of triangles to stars is 3 to 10 or 3:10. This comparison uses the operation of division.
  • The value of the ratio of triangles to stars is 310, or 0.3.
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