Listen to this song.

This song is available on Bryan Johnson's Fractions and More.

When we’re adding up fractions
Bottom numbers should be the same
Also true for subtraction
Otherwise they should change

We can do it much better
By raising fractions to higher terms
I’ll introduce a new method
And this is how your should learn

Least Common Denominators
Can be found at any time
Just factor the bottom number
And list the factors that are prime

By grouping out common factors
Find the most times they are used
Then multiply by each other
And the bottom number’s new

For example let’s tackle
Simple numbers like 6 and 9
Two and three are the factors
But three is used two times

Eighteen is the new number
Raise the fractions to higher terms
Add the fractions remaining
And that’s the lesson we learned

Least Common Denominators
Can be found at any time
Just factor the bottom number
And list the factors that are prime

By grouping out common factors
Find the most times they are used
Then multiply by each other
And the bottom number’s new

This song is available on Bryan Johnson's Fractions and More.

Many thanks to Bryan Johnson for permission to display these lyric excerpts.
© Bryan Johnson. All rights reserved. Used with permission.

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