# GRE MATH

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1. The 3 angles in a triangle add up to?
180 degrees
2. The 4 angles inside any 4 sided figure add up to?
360 degrees
3. Equilateral triangles
All sides are equal

All angles are 60 degrees
4. Isosceles triangles
2 sides are equal

2 angles are equal
5. Perimeter of a triangle
6. Third side rule
The length of any one side of a triangle must be less than the sum of the other sides

And greater than the difference between the other 2 sides
7. Area of a triangle
A= 1/2bh
8. When 2 lines intersect and 4 angles are formed, the sum of these angles is?
306
9. How many degrees does a circle contain?
360 degrees
10. Vertical angles are?
Always equal
11. In parallel lines, the sum of any big angle and any small angle will always equal to?
180 degrees
12. Popular sides of right triangles
• 3 4 5
• 6 8 10
• 5 12 13
13. Perimeter of a rectangle
Sum of its 4 sides
14. Area of a rectangle and square
A= bh
15. Area of a circle
A= πr²
16. Circumference of a circle
C= 2πr

C= πd
17. The point where the axes intersect is called?
Origin
18. Slope of a line equation
y= mx+b

• b= y-intercept
• m= slope
• x and y are any point on the line
19. Slope
Rise/Run
20. Equation to find the length  of a diagonal inside a 3 dimensional rectangular box
a²+b²+c²=d²

a,b,c are the dimensions of the figure
21. Volume of three dimensional figure
V= A(of 2 dimensional figure) h (depth)
22. Volume of a circular cylinder
πr²h
23. Surface area of a rectangular box
Sum of the areas of all its sides
24. Integers
Counting numbers

0 is an integer

Fractions are not
25. Factors
Is a number that will divide evenly into the number in the question
26. Prime numbers
Is an integers that only has 2 factors:

Itself and 1

0 and 1 are not prime numbers

2 is the only even prime number

Prime numbers are only positive
27. PEMDAS
• Parenthesis
• Exponents
• Multiplication
• Division
• Subtraction
28. Product
Result in multiplication
29. Quotient
Result of a division
30. Associative laws
When you are adding or multiplying a series of numbers, you can regroup them in any way you want
31. Multiplying with exponents

2¹ x 2²

32. Multiplying with exponents and parenthesis

(2¹)²
You multiply them

33. Dividing with exponents

2³/2²
Subtract them

34. When GRE asks you for the √ of something
It is asking you for the positive root only
35. If x²=16, then GRE is asking for
The positive and negative numbers

x=4, x=-4
36. √1
1
37. √2
1.4
38. √3
1.7
39. √4
2
40. x²-y²
(x+y)(x-y)
41. (x+y)²
x²+2xy+y²
42. (x-y)²
x²-2xy+y²
43. 2 2/3
Multiply the denominator by the integer, then adding that number to the numerator

8/3
44. 1/100
0.01

1%
45. 1/5
0.2

20%
46. 1/3
0.333...

33 1/3%
47. 1/2
0.5

50%
48. 1/10
0.1

10%
49. 1/4
0.25

25%
50. 2/5
0.4

40%
51. 3/5
0.6

60%
52. 2/3
0.6666...

66 2/3%
53. 4/5
0.8

80%
54. 2/1
2.0

200%
55. 3/4
0.75

75%
56. 1/1
1.0

100%
57. Symbol translation: Percent
/100
58. Symbol translation: is
=
59. Symbol translation: of, times, product
x
60. Symbol translation: what (or any unknown value)
any variable (x, k, b)
61. Percent increase/decrease
Percent change= difference/original x 100
62. How are ratios expressed in the GRE?
x: y

the ratio of x to y

x is to y
63. What is a proportion?
An equivalent relationship between 2 fractions or ratios

1/2 and 4/8
64. Chart on how to solve average questions
65. When you see standard deviation or normal distribution questions
66. Chart on how to solve rate questions
 Author: ceemlo ID: 263424 Card Set: GRE MATH Updated: 2014-02-23 07:07:44 Tags: GRE Folders: Description: GRE Show Answers: