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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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