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Fraction Review

Adding and Subracting Fractions

To add and subtract fractions one must first find the Least Common Denominator (LCD)
For example the LCD of and is 15. To get to have the same denominator we must
multiply the numerator and denominator of by 3. So that we have . Now we can add
together and . We get that:

Example:
The LCD of 6 and 8 is 24. Therefore multiply the numerator and denominator of by 4 and
multiply the numerator and denominator of by 3. So now we have:

Remember: A whole number , x, can be represented as . (i.e.: )

Problems

Multiplying and Dividing Fractions

To multiply fractions one needs to multiply the numerators together and the denominators
together:
Example:

To divide fractions one must take the reciprocal of the fraction in the denominator and then
multiply the fractions.
Example:

Problems: For 1 thru 5 just solve and simplify . For 6 thru 10 solve for x and simplify.


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