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= + ÷ ± ∆ ∞ × π Σ f(x) % ≤ ! ≠ * |
PERCENT - part of a hundred
When I was studying arithmetic the term we now call percent was often written per cent.
The term "per" is often used in ratios you are familiar with such as:
- miles per gallon - these days gas costs so much, it would be nice if your car got better mileage
- miles per hour - your speedometer tells you how fast your car is traveling
- dollars per hour - when you are in high school $7 or $8 for an hour would be pretty good pay
These ratios are unit rates (the measures are 1 gallon and 1 hour) ideas we use often in our everyday lives.
The term "cent" means hundred so the word percent refers to a comparison to one hundred.
A whole is 100%
Half (of a whole) is 50% and half of a half is a quarter which is 25%.
When we examine what percent equivalents are, the decimals are usually obvious once you get the idea. So, the following table will start with fractions. The tenths are obvious so I'll just show one-tenth.
TERMINATING DECIMALS REPEATING DECIMALS
fraction decimal percent fraction decimal percent
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= 0.1 | 10% | ||||
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=  = |
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= 0.125 = | 12.5% | ||||
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=  = |
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= 0.2 = | 20% | ||||
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=  = |
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= 0.25 = | 25% | ||||
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=  = |
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= 0.375 = | 37.5% | ||||
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= 0.4 = | 40% | ||||
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=  = |
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= 0.5 = | 50% | ||||
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=  = |
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= 0.6 = | 60% | ||||
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= 0.625 = | 62.5% | ||||
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=  = |
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= 0.75 = | 75% | ||||
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=  = |
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= 0.8 = | 80% | ||||
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=  = |
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= 0.875 = | 87.5% | ||||
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=  = |
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| 1 = | 1 = | 100% | ||||
| 2 = | 2 = | 200% |
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