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Conversions
When you convert from an English measurement to a Metric measurement, you multiply by a number. For example, to find out how many kilograms are in 10 pounds, you multiply 10 by .454. To find out how many meters are in 10 yards, you multiply 10 by .914. This is the procedure for every conversion except for one. When you convert from Fahrenheit to Celsius, you subtract 32 and multiply by 1/9.
Why does the temperature conversion require a subtraction and a multiplication, while all the other conversions require just a multiplication?
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