Decimal to Percent
A percentage represents a ratio as parts per hundred. The % symbol evolved from "per cento" (Italian for "per hundred"). Percentages appear in discounts, tax rates, test scores, nutrition labels, and statistics.
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Tip: 10% mental math: just move the decimal left one place. 10% of $47.50 = $4.75. Then scale up.
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Fun Fact
The % sign evolved over centuries from "per 100" written in manuscripts as "p100" or "p/100", gradually morphing into the modern symbol.
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