GRE math Flashcards
(54 cards)
1
Q
a^2 x a^3
A
a5
2
Q
a^9 / a^2
A
a^7
3
Q
(a^2)^4
A
a^8
4
Q
a^0
A
1
5
Q
m^-s
A
1/m^s
6
Q
m^(x/y)
A
(y square root m)^x
7
Q
n^(1/2)
A
square root n
8
Q
square root of 2
A
1.4
9
Q
square root of 3
A
1.7
10
Q
Division by zero
A
Can’t be done
11
Q
Prime factorization:
A
210= 2 x 105 = 2 x 3 x 35 = 2 x 3 x 5 x 7
12
Q
Like radicals can be
A
Added/subtracted
13
Q
a/b / c/d =
A
a/b x d/c
14
Q
2/3 reciprocal
A
3/2 > 1 & 2/3
15
Q
-2/3 reciprocal
A
-3/2 < 1 & -2/3
16
Q
(1/2)^2
A
1/4 < 1/2
17
Q
(-1/2)^2
A
1/4 > 1/2
18
Q
Distance
A
Speed x time
19
Q
Speed
A
Distance x time
20
Q
Time
A
Quantity/Rate
21
Q
When can you average averages?
A
Only if an equal number of terms in each set
22
Q
A U B
A
Both A & B
23
Q
|A U B|
A
|A| + |B| - |A xUx B|
24
Q
How many ways are possible?
A
Each space must be filled (ie in 1st place 7 options, in 2nd place 6 options)
25
P(A or B)=
P(A) + P(B) - P(A + B)
26
Rectangle area
LxW
27
Rectangle perimeter
2L + 2W
28
Rectangle volume
LWH
29
Square area
s^2
30
Square perimeter
4s
31
Square volume
H x S^2
32
Circle area
Pi x r^2
33
Circle circumference
2 x pi x r
34
Circle volume
Pi x r^2 x h
35
Parallelogram area
Bh
36
Parallelogram perimeter
sum of sides
37
Parallelogram volume
BhH
38
Sum of interior angles of a polygon
(n-2) x 180 (n = number of sides)
39
Sum of angles on a line
180
40
Sum of complimentary angles
90
41
Sum of supplementary angles
180
42
Sum of angles in a triangle
180
43
In crossing parallel lines what angles are equal?
Across from each other
44
In isosceles triangle what angles are equal?
Adjacent to equal sides
45
30-60-90 rule
sides: x, 2x, x root 3
46
45-45-90 rule
sides: x, x, x root 2
47
Triangle side rules
3-4-5; 5-12-13; 7-24-25; 8-15-17
48
If a & b are angles inside a triangle what is the outside angle across?
a+b
49
Area of sector in a circle
n/360(pi r^2); n is degree of angle
50
Slope
m = (Y2-Y1)/(X2-X1)= rise/run
51
Equation of a line
y = mx + b; m= slope, b= y intercept
52
Cylinder volume
Pi x r^2 x h
53
Cylinder surface area (lateral)
2 x pi x r x h
54
Total surface area
(2 x pi x r^2) + (2 x pi x r x h)
