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Instructor Overview

This lesson formally introduces and defines a ratio as a way of comparing numbers to one another.

Key Concepts

A ratio is defined by the following characteristics:

  • A ratio is a pair of numbers (a:b).
  • Ratios are used to compare two numbers.
  • The value of a ratio a:b is the quotient a ÷ b, or the result of dividing a by b.

Other important features of ratios include the following:

  • A ratio does not always tell you the values of quantities being compared.
  • The order of values in a ratio matters.

Goals and Learning Objectives

  • Introduce a formal definition of ratio.
  • Use the definition of ratio to solve problems related to comparing quantities.
  • Understand that ratios do not always tell you the values of the quantities being compared.
  • Understand that the order of values in a ratio matters.