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GRE Math > Math > Flashcards

Math Flashcards

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1
Q

One billion

A

10^9

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2
Q

First five prime numbers

A

2, 3, 5, 7, 11

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3
Q

First five composite numbers

A

4, 6, 8, 9, 10

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4
Q

Zero

A

Even, but neither positive nor negative

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5
Q

n!

A

The product of all positive integers less than or equal to n, where n is any positive integer

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6
Q

0!

A

1

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7
Q

X/0

A

Not defined

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8
Q

0^0

A

Not defined

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9
Q

The sum of the measures of the interior angles of a triangle

A

180 degrees

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10
Q

Standard normal distribution

A

Mean is 0

Standard deviation is 1

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11
Q

Gross profit

A

Sales revenue - the cost of production

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12
Q

Primes less than 20

A

2, 3, 5, 7, 11, 13, 17, 19

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13
Q

Percent change

A

Difference/original x 100

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14
Q

Group formula

A

Total = G1 + G2 + neither - both

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15
Q

Probability of events A and B

A

A x B

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16
Q

Probability of mutually exclusive events A or B

A

A + B

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17
Q

Probability of “at least once”

A

1 - probability of never

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18
Q

Rules of Exponents

A

Multiply add
Divide subtract
Power multiply

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19
Q

x^1

A

X

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20
Q

X^0

A

1

21
Q

1^x

A

1

22
Q

0^x

A

0

23
Q

(-x)^even

A

Positive

24
Q

(-x)^odd

A

Negative

25
Q

Distance

A

Rate x time

26
Q

Average speed

A

Total distance/total time

27
Q

Area of a triangle

A

A=1/2bh

28
Q

Isosceles triangle

A

Two equal sides are opposite two angles

29
Q

Common right triangles

A

3, 4, 5
6, 8, 10
5, 12, 13

30
Q

Area of a parallelogram

A

Bxh

31
Q

Circumference of a circle

A

3.14d=2(3.14)r

32
Q

Area of a circle

A

3.14r^2

33
Q

Length of an arc

A

Central angle/360 degrees x circumference

34
Q

Area of sector

A

Central angle/360 degrees x area of circle

35
Q

Equation of a line

A

y=mx+b
M is slope
B is y-intercept

36
Q

Slope

A

y2-y1/x2-x1

37
Q

Volume of cube

A

V=s^3

38
Q

Volume of box

A

lwh

39
Q

Volume of cylinder

A

3.14r^2h

40
Q

Diagonal of box

A

a^2+b^2+c^2=d^2

41
Q

First ten prime numbers

A

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

42
Q

First ten composite numbers

A

4, 6, 8, 9, 10, 12, 14, 15, 16, 18

43
Q

Factors

A

Numbers that divide evenly into a given number

44
Q

Dividing fractions

A

Multiply the first fraction by the reciprocal of the second fraction

45
Q

When you multiply or divide an inequality by a negative number,

A

You have to flip the direction of the inequality sign

46
Q

Negative exponents

A

Put the number or variable under one with the positive of the exponent

47
Q

Fractional exponents

A

The bottom of the fraction is the root and the top is the exponent

48
Q

The only time you can add or subtract roots

A

When you have the same number under the square root sign

GRE Math (1 decks)

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