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Natural Numbers (counting numbers)





. . . 3, 2, 1, 0, 1, 2, 3 . . .


any number that could be written as a fraction
Examples: 1/2, 5, .25


Decimals that do not terminate or repeat
Examples: 2 , π(pie symbol)

Real Numbers:
all of the above

Addition and Subtraction: Fractions

1. Get a common denominator.
 2. Keep the common denominator.
 3. Combine the numerators. Watch your signs.
 4. Reduce if possible


1. Simplify on the diagonals by dividing out common factors. (Cancel.)
 2. Multiply numerators.
 3. Multiply denominators.
 4. Watch your signs.


1. Change the problem to multiplication. Invert the divisor. (Remember the divisor is
 the number after the division symbol.)
 2. Follow the multiplication rules.

