Percent Problems Flashcards

Grade 7 · Math · Flashcards

Key percent vocabulary, formulas, and shortcuts for 7th grade math.

Flashcards

Percent: A ratio out of 100. 35% = 35/100 = 0.35
Part = Percent × Whole: The master percent equation. Rearrange to find any of the three values
Finding the part: Multiply: Part = decimal × whole. What is 30% of 80? 0.30 × 80 = 24
Finding the percent: Divide: Percent = part ÷ whole, then multiply by 100. 24 ÷ 80 = 0.30 = 30%
Finding the whole: Divide: Whole = part ÷ decimal. 24 is 30% of what? 24 ÷ 0.30 = 80
Discount multiplier: Sale price = original × (1 − discount rate). 25% off: multiply by 0.75
Tax/tip multiplier: Total = original × (1 + rate). 8% tax: multiply by 1.08
Percent increase formula: (New − Old) ÷ Old × 100%
Percent decrease formula: (Old − New) ÷ Old × 100%
Converting percent to decimal: Divide by 100 or move decimal 2 places left. 47% = 0.47