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| FINDING
THE LOWEST COMMON DENOMINATOR (LCD) |
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Teachers then ask their students
to circle the first product that both 6 and 9 have in common. Thus, the
lowest common denominator (LCD) for 6 and 9 is 18. This method may help
students in the beginning but is this the best way?
In algebra, students will be asked to add rational expressions
such as:
and the method for finding the LCD for (x+2) and (x2 +
3x + 2) is not the same as finding multiples of 6 and 9.
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