ID sets ALG II

counting/natural numbers

positive integers

whole numbers

positive integers including zero

integers

whole numbers and their opposites (negatives)

rational numbers

can be expressed as a fractions, terminating, and repeating decimals

irrational numbers

cannot be expressed as a ratio or fraction (decimals ending in …, square roots)

trancendental numbers (π, e)

cannot be expressed as roots of integers (π, e)

real numbers

numbers with a place on the number line

imaginary numbers

numbers with no place on the number line. (square roots of negative numbers, and nj)

complex numbers

all numbers, both real and imaginary

negative numbers

less than 0, including fractions

positive numbers

greater than 0, including fractions

non-integers

fractions, decimals, all irrational numbers

radicals

the little number on the square root thing

even numbers (integers)

numbers divisible by 2, including 0

odd numbers (integers)

not divisable by 2