#### Transcript Finding the LCM

```Finding the LCM
Rule 6-1:
To find the lowest common multiple of numbers
containing literal numbers:
1. factor each term;
2. determine the maximum number of times a
prime factor appears in any one term;
3. multiply the resulting prime factors found in
step 2. This number is the LCM.
Multiplication with Literal
Numbers
Key Point:
 In multiplication, all the literal numbers
contained in the multiplicand and the
multiplier must appear in the product
unless the exponent is zero.
Multiplying Fractions
Key Point:
To multiply fractions, we
 Cancel factors that are common to both
numerators and denominators.
 Multiply the remaining numerators (their
product is the numerator of the answer).
 Multiply the remaining denominators (their
product is the denominator of the answer).
Fractions
Rule 6-2:
To add (or subtract) fractions with unlike
denominators:
1. find the CD.
2. Change the denominator of all
fractions to this denominator.
3. Divide the CD by the old denominator
of each fraction