Math Tips

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Author:
vmacpaix
ID:
184406
Filename:
Math Tips
Updated:
2012-11-19 11:14:43
Tags:
Entrance Exams SSAT Math formulas
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Description:
Formulas to know for entrance exams
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  1. Perimeter of a rectangle
    A = 2l + 2w or 2(l + w)

    If Length = 4 and width = 6 

    • A = 2(4+6) 
    • A = 20
  2. Perimeter of a square
    A = 4s
  3. Area of a triangle
    A = (1/2)bh
  4. Area of a rectangle
     A = bh or lw
  5. Area of a square
    A = S2
  6. Diameter of a circle
    d = 2r
  7. Circumference of a circle
    C = 2πr or πd
  8. Area of a circle
    A = πr2
  9. Volume of rectangular solids
    V = lwh
  10. Pythagorean theorem
    a2 + b2 = c2
  11. Average of a set of numbers: Average
    Sum of the numbers ÷ The amount of numbers in the set

    Average of 2, 5, 6, 3, 4 

    Average = 2+5+6+3+4 / 5 = 20/5 = 4
  12. Right angles measure
    90°
  13. The sum of the interior angles of a triangle is 
    180°
  14. The sum of the interior angles of a quadrilateral is 
     360°
  15. Complementary angles add up to 
    90°
  16. Supplementary angles add up to 
    180°
  17. 1 foot = 
    12 inches
  18. 1 yard
    3 feet
  19. 1 meter = 
    100 centimeters
  20. 1 kilometer =
     1,000 meters
  21. 1 pound =
     16 ounces
  22. 1 cup = 
     8 ounces
  23. 1 pint = 
    2 cups
  24. 1 quart = 
    2 pints or 4 cups
  25. 1 gallon =
     4 quarts
  26. 1 kilogram =
     1,000 grams
  27. Commit the order of operations to memory: Think of PEMDAS  and you'll be set.
    Parentheses, Exponents, Multiplication, Division, Addition, Subtraction

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