Ratios, Proportions, and Percent Flashcards
Grade 9 · Math · Flashcards
Key vocabulary for ratios, proportions, and percent in Grade 9 Math.
Flashcards
- Ratio
- A comparison of two numbers: a to b, a:b, or a/b
- Rate
- A ratio comparing quantities with different units (e.g., miles per hour)
- Unit rate
- A rate expressed with a denominator of 1
- Proportion
- An equation showing two equivalent ratios: a/b = c/d
- Cross-multiplication
- In a/b = c/d, solve by computing ad = bc
- Percent
- Per hundred; 45% = 45/100 = 0.45
- Percent of a number
- Convert percent to decimal and multiply: p% × n = (p/100) × n
- Percent increase
- (New − Original)/Original × 100%
- Percent decrease
- (Original − New)/Original × 100%
- Markup
- An increase in price; selling price = cost + markup
- Discount
- A decrease in price; sale price = original price − discount amount
- Scale factor
- The ratio of corresponding lengths in similar figures
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