MOSTMATHSkill 05 · 6.RP.A.1, 6.RP.A.2, 6.RP.A.3

Ratios and rates

A ratio compares two amounts in a fixed order. It simplifies like a fraction, scales by multiplying both parts by the same number, and becomes a rate when the second part is one unit.

Example · Write the ratio in simplest form.

15:2015 : 20
Steps
  1. A ratio simplifies like a fraction. The greatest common factor of 15 and 20 is 5.
  2. Divide both parts by it.15:20=3:4\displaystyle 15 : 20 = 3 : 4

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