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GRE Math Notes: Set 1
fractions
9
Mathematics
Graduate
02/05/2011
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Cards

Term

Comparing Fractions:


To compare two fractions, cross-multiply

 Definition

5/6 vs. 6/7...

 

35 vs. 36
Term
A square root of a fraction makes it...
Definition
bigger
Term
(1/a)/b =
Definition
1/ab
Term
x²-y²=
 Definition
(x+y)(x-y)
Term
x²±2xy+y²=
 Definition
(x±y)²
Term
√x√y=
 Definition
√xy
Term

4x + y = 14

3x +2y = 13

 Definition

4x + y = 14

(-) 3x +2y = 13

------------------------

x - y = 1
Term
Least common multiple
 Definition

LCM of 8, 36 and 54:

 

8 = 2³

36 = 2² x 3²

54 = 2 x 3³

 

-> 2³ x 3³

 

Highest factors of them
Term
Product is the same as the...
 Definition
quotient
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