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Math facts for GRE
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even + even = even * even =
odd + odd = odd * odd =
even + odd = even * odd =
even + even =
even
even * even =
even
odd + odd =
even
odd * odd =
odd
even + odd =
odd
even * odd =
even
prime numbers through 30
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
divisibility
by 3 if sum of digits = 3
by 4 if last two digits of the number are divisible by 4
by 5 if it ends in 0 or 5
by 6 if its divisible by both 2 and 3
by 8 if the last 3 digits form a number divisible by 8
by 9 if the sum of the gidits is divisible by 9
Rules of Exponents
a
^{2}
= a * a
a
^{2}
* a
^{3}
= a
^{2+3}
= a
^{5 }
(a
^{2}
)
^{3}
= a
^{6 }
a
^{2}
/a
^{3}
= a
^{2-3}
= a
^{-1}
= 1/a
15
^{12}
- 15
^{11}
= 15
^{11}
(15-1) = 15
^{11}
(14)
Rules of Square Roots
can mult and divide square roots by each other
can only add/subtract intigers in fromt of root if its the SAME root
on GRE square root only includes the positive answer, but can square neg numbers to equal positive number
square root of 2 =
square root of 3 =
square root of 2 = 1.4
square root of 3 = 1.7
Quadratic Equations
x
^{2}
- y
^{2}
= (x + y)(x - y)
(x + y)
^{2}
= x
^{2}
+ 2xy + y
^{2}
(x - y)
^{2}
= x
^{2}
- 2xy + y
^{2}
Author
csawic
ID
108750
Card Set
Math facts for GRE
Description
math facts for gre
Updated
2011-10-13T19:48:24Z
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