GRE math

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Author:
Crista2005
ID:
99878
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GRE math
Updated:
2011-09-30 12:59:11
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GRE MATH
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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
    A=1/2r^2x(ANGLE OF RADIANS)
  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
    • ADD EXPONENTS
    • 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
  37. Quadratic formula
    • 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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