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Grade 7 Math Lab: The Algebraic Pivot FREE

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Percent Problems

45 min Grade 7 Math Lab: The Algebraic Pivot

Learning Objectives

  • Calculate percent increase/decrease
  • Find tax, discount, markup
  • Solve percent equations

Key Concepts

Percent Change

(New - Original) / Original × 100%

Markup/Discount

Percent added to or subtracted from original price

Theory

**Percent of a number:** part = percent × whole **Percent change:** - Increase: New = Original × (1 + rate) - Decrease: New = Original × (1 - rate) **Tax:** Total = Price × (1 + tax rate) **Discount:** Sale = Price × (1 - discount rate)

Examples

$80 shirt, 25% off

Solution: $80 × 0.75 = $60