Unformatted text preview: additions of fractions in the numerator and or denominator. • First , unfractionize by multiplying both numerator and denominator by the least common multiple of all the denominators in the whole wretched mess. Finally, clean up • When you get done reducing the mess to a single fraction, there may be an opportunity to simplify. • We often call this simplification process crossing out common factors . • It works because “something over itself” is just a weird way of writing the number 1, and multiplying by 1 is a “don’t change operation”. Recognizing patterns is great, but… • When you see “the same thing” in both numerator and denominator, there is a great temptation to “cross it out”. • You can only “ cancel” factors , never terms – A factor is something that is “multiplied in” – A term is something that is “added in” ) ( 119 118 2 1 2 7 1 1 1 7 1 1 2 117 1 117 it try...
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 Spring '06
 jonh
 Basic Math, Addition, Fractions, Multiplication, Elementary arithmetic, Divisor

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