Discount Calculation Examples

Mental Math · Axiom Academy

Worked examples of calculating sale prices with common discount percentages Excellent work! You've mastered calculating discounts. Here's what we learned: Two-Step Method: First calculate the discount amount, then subtract from the original price. Discount Amount Formula: Discount = Original Price × Discount Percentage (as decimal) Sale Price Formula: Sale Price = Original Price - Discount Amount Shortcut Method: Sale Price = Original Price × (1 - Discount Percentage). For example, 30% off means you pay 70%, so multiply by 0.70. Mental Math Tips: 10% is easy: just move the decimal point one place left 30% = 10% × 3: find 10%, then triple it These discount calculation skills are practical for everyday shopping and help you quickly determine if a sale is really a good deal!

This is the written version of the interactive lesson above. See the full Mental Math course.