GRE Math

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Author:
lazenby
ID:
99609
Filename:
GRE Math
Updated:
2011-09-10 00:06:06
Tags:
gre math
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Description:
Easy GRE math memorizations
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  1. 10²
    100
  2. 11²
    121
  3. 12²
    144
  4. 13²
    169
  5. 14²
    196
  6. 15²
    225
  7. 20²
    400
  8. 25²
    625
  9. 30²
    900
  10. 1
  11. 8
  12. 27
  13. 64
  14. 125
  15. 216
  16. 343
  17. 512
  18. 729
  19. 2
  20. 4
  21. 8
  22. 2⁴
    16
  23. 2⁵
    32
  24. 2⁶
    64
  25. 3
  26. 9
  27. 27
  28. 3⁴
    81
  29. 3⁵
    243
  30. 4
  31. 16
  32. 64
  33. 4⁴
    256
  34. √1
    1
  35. √2
    1.4
  36. √3
    1.7
  37. √4
    2
  38. √5
    2.2
  39. √6
    2.4
  40. √7
    2.6
  41. √8
    2.8
  42. √9
    3
  43. √10
    3.2
  44. Reciprocals
    numbers that when multiplied by each other equal 1
  45. (x + y)(x - y)
    x² - y²
  46. The Difference of Two Squares
    x² - y², (x + y)(x - y)
  47. 101² - 99²
    • (101 + 99)(101 - 99)
    • 200 x 2 = 400
  48. 81 - 64
    • (9 + 8)(9 - 8)
    • 17 x 1 = 17
  49. (x + y)²
    x² + 2xy + y²
  50. (x - y)²
    x² - 2xy + y²
  51. Interior angle sum formula
    n -2 (180)
  52. 45-45-90 Triangles, sides
    x, x, √2
  53. If the hypoteneuse of a 45-45-90 triangle is a whole number, what are the legs?
    1/2(hypoteneuse)∙√2

    eg, 1/2(10)∙√2

    5√2
  54. The two common sets of special triangle side relationships?
    3-4-5 and 5-12-13
  55. Common multiples of 3-4-5 triangles?
    • 06-08-10
    • 09-12-15
    • 12-16-20
    • 15-20-25
  56. Common multiples of 5-12-13 triangles?
    • 10-24-26
    • 15-36-39
  57. Relationship of the sides of a 30-60-90 triangle?
    x : x√3 : 2x
  58. The triangle inequality?
    A - B < C < A + B
  59. Area of a right triangle?
    (Leg × Leg) / 2
  60. Area of a rhombus?
    (Diagonal Leg 1 × Diagonal Leg 2) / 2
  61. Area of a trapezoid?
    • Average Base × Average Height
    • ie, [(B1 + B2) / 2] × [(H1 + H2) / 2]

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