GRE Math

10²

100
11²

121
12²

144
13²

169
14²

196
15²

225
20²

400
25²

625
30²

900
1³

1
2³

8
3³

27
4³

64
5³

125
6³

216
7³

343
8³

512
9³

729
2¹

2
2²

4
2³

8
2⁴

16
2⁵

32
2⁶

64
3¹

3
3²

9
3³

27
3⁴

81
3⁵

243
4¹

4
4²

16
4³

64
4⁴

256
√1

1
√2

1.4
√3

1.7
√4

2
√5

2.2
√6

2.4
√7

2.6
√8

2.8
√9

3
√10

3.2
Reciprocals

numbers that when multiplied by each other equal 1
(x + y)(x - y)

x² - y²
The Difference of Two Squares

x² - y², (x + y)(x - y)
101² - 99²
- (101 + 99)(101 - 99)
- 200 x 2 = 400
81 - 64
- (9 + 8)(9 - 8)
- 17 x 1 = 17
(x + y)²

x² + 2xy + y²
(x - y)²

x² - 2xy + y²
Interior angle sum formula

n -2 (180)
45-45-90 Triangles, sides

x, x, √2
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
The two common sets of special triangle side relationships?

3-4-5 and 5-12-13
Common multiples of 3-4-5 triangles?
- 06-08-10
- 09-12-15
- 12-16-20
- 15-20-25
Common multiples of 5-12-13 triangles?
- 10-24-26
- 15-36-39
Relationship of the sides of a 30-60-90 triangle?

x : x√3 : 2x
The triangle inequality?

A - B < C < A + B
Area of a right triangle?

(Leg × Leg) / 2
Area of a rhombus?

(Diagonal Leg 1 × Diagonal Leg 2) / 2
Area of a trapezoid?
- Average Base × Average Height
- ie, [(B1 + B2) / 2] × [(H1 + H2) / 2]

Author

lazenby

99609

Card Set

GRE Math

Description

Easy GRE math memorizations

Updated

2011-09-10T04:06:06Z