SAT Math
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Author:
Anonymous
ID:
38930
Filename:
SAT Math
Updated:
20101001 09:29:09
Tags:
SAT Math
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Description:
to lern for math sat
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Integers
Positive and negative
whole
numbers, and zero.
NOT fractions or decimals
Prime Number
An integer that has exactly two distinct factors
:
Itself and 1. All prime numbers are positiv;
the smallest prime number is 2.
One is not a prime!
Rational Numbers
rationale Zahlen
e.g. (1/3); 2; 3 ...
(not
:
e, pi, square 2
)
Irrational Numbers
Not rational!
Does not repeat, has no end.
e.g.
:
e
, pi, square(2)
Real Numbers
All numbers, except imaginary numbers
Imaginarz Numbers
e.g.: square(1)
Consecutive Numbers
The members of a set listed in order, without skipping any.
Consecutive Numbers
: 3, 2, 1, 0, 1, 2...
Consecutive positive multiples of 3
: 3,6,9,12,...
Distinct Numbers
Numbers that are different from each other
Sum
+
Difference

Product
x
Quotient
/
Remainder
The integer left over after dividing, two numbers.
e.g. 17/2,
remainder
is 1.
Remember
: on the Math Subject Test, a remainder is ALWAYS an integer!!!
Reciprocal
"Kehrwert"
Positive Difference
smaller  bigger number.
Absolute Value
"Betrag"
Arithmetic Mean
average
Median
Median
Mode
The value that occurs most often in a list. If no value appears more often than all the others in a list, then that has no mode.
Factors
Factors of an integer, are all the integers that can divide the integer.
factors are smaller then the number itself
Prime Factors
e.g.
8= 2*2*2
75= 5*5*3
Multiples
The multiples of a number are all the numbers that are evenly divisible by your original number.
smallest multiple of a is a!
"postive integer multiples of 6" = 1 x 6, 2 x 6, 3 x 6, ...