# GRE math

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1. Area of a triangle
A=1/2bXh
2. AREA OF RECTANGLE
A=wXh
3. AREA OF TRAPEZOID
A=1/2(a+b)Xh(VERTICAL HEIGHT)
4. ELIPSE
A=PIE(ab)
5. AREA OF SQUARE
A=a^2 a=LENGTH OF SIDE
6. AREA OF PARRALELOGRAM
A=bXh
7. AREA OF CIRCLE
A=PIEr^2
8. AREA OF SECTOR
9. integers
allnnumbers with no fractional or decimal parts
10. IF NUMERATORS ARE THE SAME
FRACTION WITH SMALLER DEN WILL HAVE LARGER VALUE
11. IF DENOMINATORS ARE SAME
FRACTION WITH LARGER NUMERATOR WILL HAVE LARGER VALUE
12. ODD+ODD
EVEN
13. EVEN +EVEN
EVEN
14. ODD+EVEN
ODD
15. ODDXODD
ODD
16. EVEN X EVEN
EVEN
17. ODD X EVEN
EVEN
18. NUMBER DIV BY 2
LAST DIGIT IS DIVISIBLE BY 2
19. NUMBER IS DIVISIBLE BY 3 IF
SUM OF DIGITS IS DIVISIBLE BY 3
20. NUMBER IS DIV BY 4 IF
• LAST 2 DIGITS ARE DIVISIBLE BY 4
• EX 1748 IS BECAUSE 48 IS
21. NUMBERS IS DIV BY 5 IF
LAST DIGIT IS 0 OR 5
22. NUMBER IS DIV BY 6 IF
IT IS DIVISIBLE BY 2 AND 3 BOTH
23. NUMBER IS DIV BY 9 IF
IF SUM OF ITS DIGITS IS DIVISIBLE BY 9
24. NUMBER IS DIV BY 10 IF
LAST DIGIT IS 0
25. NUMBER IS DIV BY 12 IF
IT IS DIVISBLE BY 3 AND 4
26. SUM OF VALUES
SUM OF VALUES = AVERAGE VALUExNUMBER OF VALUES
27. AVERAGE A PER B
AVERAGE A PER B= TOTAL A/TOTAL B
28. MULT 2 TERMS W SAME BASE
X^3*X^3
• X^6
29. TO DIVIDE 2 TERMS W SAME BASE
4^4/4^2
• KEEP THE BASE AND SUBTRACT THE EXPONENT FROM DEN FROM EXP OF NUMERATOR
• 4^2
30. TO RAISE A POWER TO ANOTHER POWER
(3^2)^4
• MULTIPLY THE EXP
• 3^8
31. ANY NON ZERO NUMBER RAISED TO POWER OF ZERO
1
32. NEGATIVE EXPONENT
2^-3
• INDICATES A RECIPROCAL TAKE RECIPROCAL OF BASE AND CHANGE SIGN OF EXPONENT
• 1/2^3
33. Simple Interest
• I=PRT
• time is in years and rate is in decimal form
34. Simple Interest Amounts
A=P(1+rt)
35. Compound Interest
• A=P(1+r/c)^tc
• c= #of times compounded annually
• r=decimal
• t=time in years
36. Distance equation
• D=RT
• R=D/T
• T=D/R
• ax^2+bx+c=0
• a,b,c are real numbers
• a doesn't equal 0
• x=-b+ or - Square root of B squared-4ac /2a
38. rules of inequalities
if inequalities is multiplied or divided by a neg # the direction of the inequality is reversed.
39. change in slope of line
change in y/change in x
40. parrallel lines s perpendicular lines
same slope vs neg reciprocals
41. domain vs range
x values vs yor f(x) values
42. f(x)+c
increase c units
43. f(x)-c
decrease c units
44. f(x+c)
left c units
45. f(x-c)
right c units
46. iscoceles triangle
has 2 sides of equal length. sides are legs and third side is base. Angles opposite the legs have same measure
47. equilateral triangles
3 sides of equal length and 60degree angles.
48. similar triangles
• same shape and corresponding angles have same measure ex: any 30-60-90 triangles are similar.
• ratio of areas of 2 similar triangles is square of ratio of corresponding lengths.
49. congruent triangles
corresponding angles have same measure and sides have same length
50. special right triangles
• 3:4:5
• 5:12:13
• 1:1:square root of 2/(45-45-90)hyp=sq rt of 2, legs r 1
• 1:square root of 3:2 is (30-60-90)-hyp=2 opposite 30=1 andsq rt of 3 opposite 60 degree
51. COMBINATION FORMULA
• C=n/K(n-k)
• n=TOTAL # OF ITEMS
• k=# TO BE CHOSEN
52. INTERIOR ANGLES OF POLYGONS
• =180(n-2)
• n=#OF SIDES
53. WORK FORMULA
1/a+1/b=1/t
54. CIRCUMFRENCE OF CIRCLE
=2PIEr
55. ARC LENGTH
=n/360*CIRCUMFERENCE
56. AREA OF SECTOR
=n/360*AREA OF CIRCLE
57. VOLUME OF RECTANGLULAR SOLID
vs surface area
• v=area of base*height=length*width*height
• surface area=sum of arease of faces=2lw+2lh+2wh
58. volume of cube (all equal sides)vs
surface area
• e^3 or lwh
• 6e^2
59. volume of cylinder
pie*r^2*h
60. surface area of cylinder
2(pie*r^2)+2*pie*r*h
61. Sum of avg of numbers
sum of numbers/n=avg of numbers

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 Author: Crista2005 ID: 99878 Filename: GRE math Updated: 2011-09-30 16:59:11 Tags: GRE MATH Folders: Description: GRE MATH Show Answers:

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