Pre Algebra (Period 2 & 4)

Multiplying & Dividing Fractions 5-4

(skipped 5-3 negative fractions until tomorrow)


EASIEST FRACTION SKILL BECAUSE YOU DON'T NEED A COMMON DENOMINATOR!!!!



MULTIPLICATION

1. Turn any mixed number into an IMPROPER FRACTION

2. Simplify or Cross cancel if possible (it makes the math easier!)

3. Multiply numerator x numerator and denominator x denominator

4. Simplify if necessary



DIVISION:

WE NEVER DIVIDE, WE FLIP THE SECOND FRACTION AND MULTIPLY!


(never, ever touch the first fraction!)


1. Turn any mixed number into an IMPROPER FRACTION

2. FLIP THE SECOND FRACTION AND CHANGE TO MULTIPLICATION


3. Cross cancel if possible (it makes the math easier!)

4. Multiply numerator x numerator
and the denominator x denominator


5. Simplify if necessary



NEGATIVES:

Follow your integer rules (FINGER RULES) to determine the sign



VARIABLES:
You can cross cancel them as well!