Name given to certain ratios that generally include different kinds of quantities.

  • A rate can be expressed in decimal notation, fractional notation, or as a percentage.
  • A rate can express how one variable changes based on another one, as is the case for speed, where the distance covered depends on how much time has passed: d = \(\frac{v}{t}\).
  • A rate can also be used to compare the real dimensions of one object to those of a model.
  • It is acceptable to use the slash to write a rate, as in: 80 km/h or 12 L/100 km.


  • The birth rate corresponds to the number of births per 1000 inhabitants in a given region.
  • The rate of increase in a salary is the percentage of increase in a salary per $100 of the current salary.
  • The rate of variation in a stock market index expresses, in units of variation (percentage points), the increase or decrease of the value of a share or a group of shares between two observations.

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