# [Numeracy 110] Re: introductions

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Barbara Murray bamurr at metrocast.net
Sat Feb 6 18:22:16 EST 2010

The least common multiple is used to find the lowest common denominator.

Example: Add 1/2 + 1/3 + 1/4 + 1/6

The multiples:
of 2 are 2 4 6 8 10 12 14 16 18 20 22 24. . .
of 3 are 3 6 9 12 15 18 21 24 . . .
of 4 are 4 8 12 16 20 24. . .
of 6 are 6 12 18 24 . . .

The least common multiple is 12 and this is also the lowest common denominator. Notice that 24 is also a common multiple, but it is not the least common multiplie. It is also not the lowest common denominator, although it would be A common denominator.

1/2 = 6/12
1/3 = 4/12
1/4 = 3/12
1/6 = 2/12

The sum is 15/12 = 1 3/12 = 1 1/4

----- Original Message -----
From: George Demetrion
To: numeracy at nifl.gov
Sent: Saturday, February 06, 2010 2:56 PM
Subject: [Numeracy 109] introductions

Good afternoon all.

While I am an experienced adult educator I am a newbie math teacher, but I'm plugging away in my first transitions to college basic math course.

We've had two three hour sessions thus far in a 15 week course and things are moving along okay.

To be sure I've put a lot of time practicing my math through basic algebra and concentrating on the assignments in our weekly sessions.

I'm learning and I'm also getting a good experiential dose of math phobia, which in turn, in the process of transforming in the process of learning and then drawing on my overall teaching skills, especially incorporating basic explanation, a lot of practice and collaborative scaffolding instructional processes.

One technical question:

What is the difference between the Lowest (or least) Common Denominator and the Least Common Multiple and what different functions do they accomplish?

Keep it simple and straightforward, please.

George Demetrion
East Hartford, CT

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