Percent of a number

Math

Definition

Finding a percentage of a number means multiplying the number by the percent expressed as a decimal. This is one of the most common real-world math applications.

Examples

  • 20% of 80 = 0.20 × 80 = 16
  • Finding a 15% tip on a $45 meal: 0.15 × 45 = $6.75
  • 8.5% sales tax on a $200 purchase: 0.085 × 200 = $17
Key Fact

Part = Percent × Whole, or equivalently: Percent = Part / Whole × 100

Related Terms

Percent conversions Percent change Discounts and tax

Study This Concept

Practice percent of a number with free review games in these units:

Pre-Algebra Unit 4: Percents