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Adding Fractions with Different Denominators
Determine the Greatest Common Factor of 9 and 12 which is 3. Either multiply the denominators and divide by the G.C.F. (9*12=108, 108/3=36) OR  Divide one of the denominators by the G.C.F. and multiply the answer by the other denominator (9/3=3, 3*12=36) Rename the fractions to use the Least Common Denominator (2/9=8/36, 3/12=9/36) The result is 8/36 + 9/36 Add the numerators and put the sum over the LCD = 17/36 Simplify the fraction if possible. In this case it is not possible. 
The Complete Mathematical Terms Dictionary
Understanding math concepts is critical in our world today. Math is used daily by nearly everyone, from lay persons to highly degree professionals. Situations in which math is used vary from simply balancing a checkbook or calculating the amount of change due from a store transaction all the way to making blueprints for an office building or house and the construction of those buildings. Understanding how to solve math problems becomes easier as one learns math terminology. Below is a list of many common math terms and their definitions.

“If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is.”
― John von Neumann “Women have a passion for mathematics. They divide their age in half, double the price of their clothes, and always add at least five years to the age of their best friend.”
― Marcel Achard As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.
 Albert Einstein 
“Mathematics expresses values that reflect the cosmos, including orderliness, balance, harmony, logic, and abstract beauty.”
― Deepak Chopra “In real life, I assure you, there is no such thing as algebra. ”
― Frances Ann "Fran" Lebowitz “The important thing to remember about mathematics is not to be frightened”
― Richard Dawkins Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
Albert Einstein 