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1.
Arc length: X = Measure of interior angle

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Circumference of circle 360

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Circumference of circle 360

2.
Area of a circle: A=pi*(r^2)

3.
Area of a rectangle: A=l*w

4.
Area of a sector: X = Measure of interior angle

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Area of Circle 360

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Area of Circle 360

5.
Area of a trapezoid: A= (1/2)h*(a+b) where a is the length of the bottom base and b is the length of the top base.

6.
Area of a triangle: A= (1/2)b*h

7.
Area of parallelogram: A=b*h

8.
Circumference of a Circle: c=2**pi**r OR d*pi

9.
Convert 12.5% to a fraction: 1/8

10.
Convert 16.66% to a fraction: 1/6

11.
Convert 20% to a fraction: 1/5

12.
Convert 25% to a fraction: 1/4

13.
Convert 33.33% to a fraction: 1/3

14.
Convert 40% to a fraction: 2/5

15.
Convert 60% to a fraction: 3/5

16.
Convert 66.66% to a fraction: 2/3

17.
Convert 75% to a fraction: 3/4

18.
Convert 80% to a fraction: 4/5

19.
Convert 83.33% to a fraction: 5/6

20.
Find distance when given time and rate: d=rt so r= d/t and t=d/r

21.
Find hypotenuse of a right triangle given 2 side lengths: Pythagorean Theorem: h^2= (S1)^2 + (S2)^2

22.
First 10 prime #s: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29

23.
How to find the average of consecutive #s: Take the average of the largest and smallest # in the set. (i.e. for the set of consecutive #s 5....172 would be (172+5)/(2)= 88.5)

24.
How to find the sum of consecutive #s: Sum= (Average of Consecutive #s) * (# of terms in set)

25.
How to recognize a # as a multiple of 3: The sum of the digits is a multiple of 3

26.
How to recognize a # as a multiple of 4: The last 2 digits are a multiple of 4. (i.e 144. 44 is a multiple of 4, so 144 must also be a multiple of 4.)

27.
How to recognize a # as a multiple of 9: The sum of the digits is a multiple of 9.

28.
How to recognize a multiple of 6: Sum of digits is a multiple of 3 and the last digit is even.

29.
How to recognize if a # is a multiple of 12: The sum of the digits it a multiple of 3 and the last two digits is a multiple of 4. (i.e 144: 1+4+4=9 which is a multiple of 3, and 44 is a multiple of 4, so 144 is a multiple of 12.)

30.
Perfect Squares 1-15: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225

31.
Perimeter of a rectangle: P= 2L + 2w

32.
Quadratic Formula: X= -b (+/-) Sqrroot [(b^2) -4ac)]

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2a

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2a

33.
Side lengths of a 30-60-90 right triangle: 1-sqrroot of 3-2

34.
Side lengths of a 45-45-90 right triangle: 1-1-sqrroot of 2

35.
Slope given 2 points: m= (Y1-Y2)/(X1-X2)

36.
Surface area of a rectangular solid: SA= 2( L**w + L**h + w*h)

37.
Surface area of a right circular cylinder: 2(pi**(r^2))+ 2**pi**r**h

38.
Surface area of a sphere: SA= 4**pi**(r^3)

39.
Volume of a rectangular box: V=L**w**h

40.
Volume of a right circular cylinder: pi**(r^2)**h

41.
Volume of a sphere: V=(4/3)**pi**(r^3)

42.
When asked to find the distance between 2 points on a graph use this formula...: Distance formula. Distance= Sqrareroot[((Xa-Xb)^2) + ((Ya-Yb)^2)]

43.
When dividing exponential #s with the same base, you do this to the exponents...: Subtract them. i.e (5^7)/(5^3)= 5^4

44.
When multiplying exponential #s with the same base, you do this to the exponents...: Add them. i.e. (5^7) * (5^3) = 5^10

45.
When solving an inequality, flip the sign when you....: divide or multiply both sides by a NEGATIVE number

## Formulas for GRE Quantitative SectionStudy online at quizlet.com/_b4k69 |

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