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Questions and Answers
What is the percentage increase of 240 from 200?
What is the percentage increase of 240 from 200?
- 25%
- 30%
- 16%
- 20% (correct)
What is 1/5 of 345?
What is 1/5 of 345?
- 68
- 69 (correct)
- 67
- 71
What is the equivalent fraction of 2/5 in thirds?
What is the equivalent fraction of 2/5 in thirds?
- 3/7
- 4/9
- 5/12
- 6/15 (correct)
What is the sum of 247, 189, and 216?
What is the sum of 247, 189, and 216?
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What percentage decrease is 180 from 240?
What percentage decrease is 180 from 240?
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What percentage of 360 is 90?
What percentage of 360 is 90?
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A bookstore has 420 books, and 30 more are added. What is the percentage increase?
A bookstore has 420 books, and 30 more are added. What is the percentage increase?
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What is 3/4 of 288?
What is 3/4 of 288?
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What is the equivalent fraction of 3/4 in sixths?
What is the equivalent fraction of 3/4 in sixths?
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What is 0.45 as a percentage?
What is 0.45 as a percentage?
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Study Notes
Percentages of 3-Digit Numbers
- To find a percentage of a 3-digit number, multiply the number by the percentage (as a decimal)
- For example, 25% of 240 = 240 × 0.25 = 60
Percentage Increase and Decrease
- To find the percentage increase, first find the difference between the two values, then divide by the original value and multiply by 100
- For example, if a value increases from 150 to 180, the percentage increase is ((180 - 150)/150) × 100 = 20%
- To find the percentage decrease, follow the same steps, but subtract the difference from 100 to get the percentage decrease
Fractions of 3-Digit Numbers
- To find a fraction of a 3-digit number, multiply the number by the numerator (top number) and divide by the denominator (bottom number)
- For example, 1/4 of 240 = (1/4) × 240 = 60
Equivalent Fractions
- Equivalent fractions have the same value, but different numerators and denominators
- To find an equivalent fraction, multiply or divide both the numerator and denominator by the same number
- For example, 1/2 is equivalent to 2/4, as both have the same value (halve of the whole)
Converting Decimals to Percentages
- To convert a decimal to a percentage, multiply by 100
- For example, 0.25 as a percentage is 0.25 × 100 = 25%
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