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### 39 Cards in this Set

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 How does one multiply fractions? (i.e. a/b * c/d) Multiply the numerators and denominators straight across. (a*c/b*d) Think simple. REALLY simple. How does one divide fractions? (i.e. a/b / c/d) You invert the divisor (the second number), and then multiply! (a/b * d/c) They call him Flipper, Flipper, faster than liiiightning... How does one add fractions of the same denominator? (i.e. a/b + c/b) Add the numerators! (a+c/b) (no hint. this is pretty obvious.) How does one add fractions of different denominators? (i.e. 2/5 + 3/7) Find a common denominator, and multiply the numerators by said denominator. Then add the numerators and put it over the common denominator. (common denominator = 35. 35/5 = 7 and 35/7 = 5, so 2*7 = 14 and 3*5 = 15... SO, 14 + 15 = 29 ...and our final answer is 29/35!! Gee, I wish they had some common ground... What if there are common factors in the numerator and the denominator? (i.e. ab/cb) Cancel out the common factors. It basically gets divided by itself, therefore disappearing from the problem altogether. (ab/cb = a/c) What if two fractions are set equal to one another? (i.e. a/b=c/d) Cross multiply. (if a/b=c/d, then ad=bc) What is the relation between division and the inverse of a number? Dividing a number by something is the same as multiplying it by 1 over that number. (i.e. a/b = a*1/b) What is set builder notation? Set-builder notation is written like: A={x|x is an integer and 0