# GRE Math

The flashcards below were created by user lazenby on FreezingBlue Flashcards.

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]
 Author: lazenby ID: 99609 Card Set: GRE Math Updated: 2011-09-10 04:06:06 Tags: gre math Folders: Description: Easy GRE math memorizations Show Answers: