Unit 1 Alg. II Test SAT Packet

Natural numbers

1, 2, 3... (when you ask a child to start counting)

Whole number

Natural numbers + 0

Integers

Whole numbers including those that are negative
-3, -2, -1, 0, 1, 2, 3

Rational numbers

fractions, decimals (terminating or repeating), including integers, whole numbers, etc.

Irrational numbers

any decimal that goes on forever
pi, square root of 2

set

any collection of objects, people, or things that are carefully defined

member or element

what a term inside a set is called

E

used to say "is an element of"
7 E {prime numbers}

O w/ line through it

empty set, can also be written as { }

subset

A = {0, 1, 2, 3}
subsets: {0} {1} {2} {3} {o} {0, 1, 2, 3}

intersection

a ________ of two sets consists of the elements they have in common
symbol is like: n
A n B = C or {2,4,6,8,10} n {3,4,5,6,7,8} = {4,6,8}

union

when ALL the elements of both sets are listed without repeating any elements twice
sign is u