GRE math
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the angles in a triangle sum up to
180 degrees
order of operations
parentheses first (innermost to outer)
exponents or radicals
multiplication and division
addition and subtraction
percent formula
part= percent x whole
percent increase
percent increase= amount of increase/ original whole x 100%
percent decrease
percent decrease= amount of decrease/original whole x 100%
how to recognize if multiples of 2
last digit is even
how to recognize if multiples of 3
sum of digits is a multiple of 3
how to recognize multiples of 4
last two digits are multiples of 4
how to recognize multiples of 5
last digit is 5 or 0
how to recognize mulitples of 6
sum of digits is a multiple of 3 and last digit is even
how to recognize multiples of 9
sum of digits is a multiple of 9
how to recognize multiples of 10
last digit is 0
how to recognize multiples of 12
sum of digits is a multiple of 3 and last two digits are a multiple of 4
average
average= sum of terms/ number of terms
using average to find sum
sum=(average) x (number of terms)
how to find the number of integers from A to B inclusive
B-A+1
median
put the numbers in numerical order and take to the middle number
mode
take the number that appears most often
range
take the positive difference between the greatest and least values
probability
probability= number of favorable outcomes/ total number of possible outcomes
polynomial
an expression consisting of the sum of two or more terms
inequalities
remember to reverse the inequality sign if you multiply or divide by a negative quality
absolute value
the distance the number is from zero to the number on the number line, absolute value is always positive
area of a triangle
are= 1/2 (base)(height)
isosceles triangles
two equal sides and two equal angles
equilateral triangles
three equal sides and three 60 degree angles
similar triangles
corresponding angles are equal and corresponding sides are proportional
how to find the hypotenuse or leg of a right triangle
pythagorean theorum
a
^{2}
+ b
^{2}
= c
^{2}
special right triangles
3:4:5
5:12:13
30 degree
: 60 degree: 90 degree
45degree
: 45 degree: 90 degree
1: √3
: 2
1:1:√2
perimeter of rectangle
perimeter= 2(length + width)
area of rectangle
area= (length)(width)
area of square
area= side
^{2}
area of parallelogram
area= (base)(height)
area of trapezoid
break figure into rectangle and triangle
circumference of a circle
circumference= 2(pie)r= (pie)d
area of circle
area= (pie)r
^{2}
slope of line
slope= rise/run= change in y/change in x
simple interest problem
interest= (principal) x (interest rate)x time
interest rate is expressed as decimal
time is in years or fraction of years
finding compound interest
(final balance)= (principal) x (1+ interest rate/C)
^{(time x C)}
c= number of times compounded annually
find average rate
average A per B= Total A/Total B
average speed
average speed= total distance/ time
combined work problem
1/r + 1/s= 1/t
r and s are number of hours it would take two people to complete work
t is the total time
Card Set Information
Author:
cfalgo1
ID:
224298
Filename:
GRE math
Updated:
2013-06-20 20:50:59
Tags:
GRE math
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Description:
GRE math
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