GRE

  1. How to find the Hypotenuse or a leg of a right triangle
    Pythagorean theorem: Image Upload 1
  2. Area of a triangle
    Image Upload 2
  3. Special Right Triangles
    3:4:5

    5:12:13

    30-60-90

    45-45-90
  4. Spot Special Right Triangles
    1-Image Upload 3-2

    1-1-Image Upload 4
  5. Perimeter of a Rectangle
    P = 2 (lenght +width)
  6. Area of a Rectangle
    Area = (lenght)(width)
  7. Area of a Square
    A = Image Upload 5
  8. Area of a Parallelogram
    A = (base)(height)
  9. Area of a Trapezoid
    A = (average of parallel sides) X (height)
  10. What is the area?Image Upload 6
    A = 50
  11. Image Upload 7
    12 - 8 = 4
  12. Image Upload 8
    • 35+45+X = 180
    • 80+X = 180
    • X = 100
  13. PEMDAS order
    • P arenthesis
    • E xponents (or radicals)
    • M ultiplication
    • D ivision
    • A ddition
    • S ubstraction
  14. Solve:

    9-2x(5-3)^2+6 / 3
    = 3
  15. Percent Formula
    Part = Percent x Whole
  16. what is 12% of 25?
    Part = Image Upload 9
  17. 45 is what % of 9?
    • Image Upload 10
    •    
    • Image Upload 11
  18. 15 is Image Upload 12 % of what number?
    Image Upload 13

    Image Upload 14

    Image Upload 15
  19. Percent increase formula
    Image Upload 16
  20. Percent decrease formula
    Image Upload 17
  21. The price goes up from $80 to $100. What is the % increase?
     Image Upload 18
  22. How to predict whether a sum, difference, or product will be ODD or EVEN
    Just take simple numbers like 2 and 3
  23. If m is even and n is odd, is the product mn odd or even?
    m=2 and n=3

    Image Upload 19 is even, so mn is even
  24. How to recognize MULTIPLES of 2
    last digit is even
  25. How to recognize MULTIPLES of 3
    sum of digits is a multiple of 3
  26. How to recognize MULTIPLES of 4
    last two digits are a multiple of 4
  27. How to recognize MULTIPLES of 5
    last digit is 5 or 0
  28. How to recognize MULTIPLES of 6
    sum of digits is a multiple of 3, and last digit is even
  29. How to recognize MULTIPLES of 9
    sum of digits is a multiple of 9
  30. How to recognize MULTIPLES of 10
    last digit is 0
  31. How to recognize MULTIPLES of 12
    sum of digits is a multiple of 3, and last two digits are a multiple of 4
  32. How to use the AVERAGE to find the SUM
    Image Upload 20
  33. 17.5 is the average of 24 numbers. What is the sum of the 24 numbers?
    Sum = 17.5 X 24 = 420
  34. Average of consecutive numbers
    average of evenly spaced numbers is simply the average of the smallest number and the largest number.
  35. What is the average of all the integers from 13 to 77?
    Image Upload 21
  36. How to count consecutive numbers
    the number of integers from A to B inclusive is B - A + 1
  37. How many integers are there from 73 through 419, inclusive?
    419 - 73 + 1= 347
  38. How to find the Sum of Consecutive Numbers
    Sum = (Average) X (Number of terms)
  39. What is the sum of the integers from 10 through 50, inclusive?
    Average = Image Upload 22

    • Number of terms = 50-10+1 = 41
    • Sum = Image Upload 23
  40. what is the median of 88, 86, 57, 94, and 73?
    86
  41. What is the median of 88, 86, 57, 73, 94, and 100?
    Image Upload 24
  42. Simple Interest
    interest = principal X interest rate (decimals) X time (years or fract of year)
  43. Compound interest
    Image Upload 25
  44. If $10000 is invested at 8 percent annual interest, compounded semiannually, what is the balance after 1 year?
    = $10816
  45. If $12000 is invested at 6 percent simple annual interest, how much interest is earned after 9 months?
    = $540
  46. Permutation Formula
    Image Upload 26

    • where n=#in the larger group
    •           k=#to arrange
  47. Five runners run in a race. The runners who come in first, second, and third place will win gold, silver, and bronze medals respectively. How many possible outcomes for gold, silver, and bronze medal winners are there?
    Image Upload 27
  48. How many different ways are there to choose 3 delegates from 8 possible candidates?
    Image Upload 28
  49. Combination Eq
    Image Upload 29

    • n=#in larger group
    • k=#we are choosing
Author
crixtov
ID
238335
Card Set
GRE
Description
This set has mathematical GRE KEYS
Updated