SAT Math

Positive and negative whole numbers, and zero. NOT fractions or decimals

• 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!

• rationale Zahlen
• e.g. (1/3); 2; -3 ...
• (not: e, pi, square 2)

• Not rational!
• Does not repeat, has no end.
• e.g.: e, pi, square(2)

All numbers, except imaginary numbers

e.g.: square(-1)

• 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,...

Numbers that are different from each other

+

-

x

/

• 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!!!

"Kehrwert"

smaller - bigger number.

"Betrag"

average

Median

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 of an integer, are all the integers that can divide the integer.
• factors are smaller then the number itself

• e.g.
• 8= 2*2*2
• 75= 5*5*3

• 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, ...