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14 Cards in this Set
- Front
- Back
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What is an easier way of finding, say, 25% of a number?
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know that 25% is 1 out of 4 and that 1 out of 4 of 32 is 8!
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How do you convert a percent to a decimal?
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Drop the % and move the decimal point two places to the left adding zeros if neccessary.
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How do you convert a percent to a fraction?
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Drop the %, write the number over 100 and reduce
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How do you convert a decimal to a percent?
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move the decimal point two places to the right adding zeros if necessary and then add the %
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How do you convert a fraction to a decimal?
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First convert the fraction to a decimal then convert the decimal to a percent.
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What is the formula for a percent increase of quantity?
A percent decrease? |
actual increase or decrease over original amount times 100
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If a is smaller than b, the % increase in going from a to b is always ___ than the % decrease going from b to a?
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greater than
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To increase a number by k%, what should you do?
To decrease? |
Multiply it by 1 + k%
Multiply it by 1 - k% |
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An increase of k% followed by a decrease of k% is always what?
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is always less than the original value.
The original value is never regained. |
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A decrease of a% followed by a decrease of b% always results in what? Compared to?
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Always results in a smaller decrease than a single decrease of (a + b)%
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An increase of a% followed by an increase of b% always results in what?
Compared to? |
A larger increase than a single increase of (a + b)%
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An increase or decrease of a% followed by another increase of decrease or a% is never what?
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It is never the same as a single increase or decrease of 2a%.
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If a number is the result of increasing another number by k% to find the original number, divide by what?
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1 + k%
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If a number is the result of decreasing another number by k% to find the original number, divide by what?
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1 - k%
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