MATH TIDBITS FOR GRE TWO

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shockwave
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271220
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MATH TIDBITS FOR GRE TWO
Updated:
2014-04-20 14:00:01
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MATH TIDBITS GRE TWO
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MATH TIDBITS FOR GRE TWO
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MATH TIDBITS FOR GRE TWO
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  1. every rational number can be expressed as a terminating or repeating decimal, BUT WHAT IF ITS SOMETHING LIKE THIS:
    0.010110111011110111110. . .
    THEN ITS IRRATIONAL. IT GOES ON INDEFINITELY.

    THEY DO NOT TERMINATE (10/2=5) OR REPEAT (1/3 = .33333 WITH A BAR OVER THE LAST 3).
  2. WHAT IS THE CLASSIFICATION OF NUMBERS.
    • NATURAL
    • WHOLE
    • INTEGERS
    • RATIONAL
  3. √(9) is a ________ number.

    It is because √(9) = 3
    • Notice that √(9) is a natural number.
    • It is because √(9) = 3
  4. DEFINE:
    All integers are fractions.
    Not all fractions are integers.
    • Example: -2 is an integer and can be written as -2/1 to make it a fraction.
    • However, -1/3 = -0.333333333 is not an integer, ITS A RATIONAL NUMBER. 
  5. Irrational numbers are numbers that cannot be written as a ___________.
    Irrational numbers are numbers that cannot be written as a fraction.

    Another way to see them is that they are neither repeating decimals nor terminating decimals.

    • Examples:
    • pi= 3.14...,
    • 2.224879566117426874,
    • √(7)
  6. 2<x<3
    THIS IS KNOWN AS WHAT AND WHAT IS THE X CALLED?
    DOUBLE INEQUALITY. 

    THE X IS KNOWN AS THE INTERVAL. THERE ARE 4 TYPES DEPENDENT UPON IF THE END NUMBERS ARE COUNTED IN THE EQUALITY OR NOT. 

    • X<4
    • X>4
    • X≤4
    • X≥4
  7. DEFINE triangle inequality.
    If a is positive and b is negative, then ab is negative.
  8. Be careful not to confuse 0.01 with 0.01%.
    The percent symbol matters!

    0.01 = _____%
    0.01% = ______
    0.01 = 1%

    0.01% = 0.01/100 = 0.0001

    WATCH YOUR DECIMAL PLACEMENTS!!!

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