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Questions and Answers
What is 0.39 as a percentage?
What is 0.39 as a percentage?
- 39% (correct)
- 25%
- 20%
- 10%
What is 18 as a percentage of 72?
What is 18 as a percentage of 72?
- 25% (correct)
- 100%
- 72%
- 20%
What is 9 as 10% of?
What is 9 as 10% of?
- 10
- 190
- 100
- 90 (correct)
What is 3% as a decimal?
What is 3% as a decimal?
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What is the percent change from 200 to 105?
What is the percent change from 200 to 105?
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Study Notes
Percentages
- 0.39 can be written as 39% or as a fraction 39/100
- Percentage change from 200 to 105 is a 47.5% decrease
Calculating Percentages
- To find the percentage of a number, divide the part by the whole and multiply by 100 (e.g., 18 is what percent of 72? = (18 ÷ 72) × 100)
- To find the original number, divide the part by the percentage and multiply by 100 (e.g., 9 is 10% of what number? = 9 ÷ 10% × 100)
Percentages in Real-World Scenarios
- To calculate a tip, multiply the total cost by the percentage (e.g., 18% of $50 = $50 × 0.18)
- The total cost including the tip is the sum of the cost and the tip (e.g., $50 + $9 = $59)
Decimal and Fraction Conversions
- 3% can be written as a decimal (0.03) or as a fraction (3/100)
Rounding Numbers
- 18.369 rounded to the nearest tenth is 18.4
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