Pre Algebra Period 1

Rational Numbers 4-6

THE NUMBER SYSTEMS

Natural (counting): 1, 2, 3, ....

Whole: 0, 1, 2, 3, ...

Integers: ...-3, -2, -1, 0, 1, 2, 3, ...

Rational: All numbers that can be written as a fraction or RATIO (decimals-terminating and repeating, fractions, mixed numbers, integers)

Irrational: Decimals that never terminate or repeat - like pi and square root of 2


Real numbers: All the number systems together



Complex or Imaginary Numbers: we don't study these until Algebra II, but they are stated as

a + bi where i is equal to the square root of -1



Again, Rational number = any number that can be expressed as the ratio (fraction) of two integers

a/b, where a and b are both integers and b cannot be zero

b cannot be zero because you cannot divide by zero.....IT'S UNDEFINED!


There are positive and negative rational numbers.