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Percent as decimal
- move decimal to the left
- {ex. 0.026 = 0.0026}
- move from right to left if number has no decimal
- {ex. 526% = 5.26}
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Decimal to percent
- move decimal right
- {ex. 0.954 = 95.4%}
- move decimal from left to right if number has no decimal
- {ex. 705 = 70,5000%}
- any additional zeros can be dropped
- {ex. 0.0063 = 0.63%}
be sure to add %
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Percent as a fraction or mixed number
- make percent a fraction over 100
- {ex. 15% = 15/100}
- Simplify fraction is possible
- {ex. 15% = 15/100[divide both sides by 5] = 3/20}
- if percent is converted and fraction is improper, convert fraction to a mixed fraction and simplfy if possible
- {ex. 725% = 725/100= 7 25/100 {divide both sides by 25] = 7 1/4}
- if percent is a decimal, move decimal but add same number of zeros in demominator
- {ex. 1.45% = 1.45/100 = 145/10000 [divide both sides by 5] = 29/2000}
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Fraction to percent
- use long division then convert decimal to percent ( moving to right)
- {ex. 6/25 = 25/6(divide) = 0.24(move decimal) = 24%}
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Solving Equation
is/of = %/100
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Simple Interest
I = p*r*t
- p = principle
- r = rate of interest ( decimal)
- t = time in years
- I = interest
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Tax
- tax = taxrate * subtotal (decimal)
- subtotal = cost + tax
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Commission
commission = total sales * commission rate (decimal)
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Discount
- discount = price * discount rate (decimal)
- sales price = original price - discount
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