# Mr. R.’s World of Math

LYRICS:

It was my mother’s birthday,
A day that can’t be beat,
with frosting that was sweet…
My mother frowned a frown,
A serious reaction,
“I can’t eat an entire slice,
I only want a fraction…”
She felt really full,
She’d eaten so much stuff,
½ plus ¼
Would really be enough…
she said ½ plus ¼
Would really be enough…”

I was caught off guard,
It was really hard,
Should I make a list?
Could I use a graph? I needed help to add, one quarter to one half!
I needed help to add, one quarter to one half!

You gotta make the denominators match!
Quarters with quarters and halves with halves,
Fifths with fifths! Denominators match,
Matching your fractions like thirds with thirds,
You can‘t add elephants to blue birds!

I think I got it right,
2/6 is what I got,
my brother said, “Not quite!”
No no, no no,no no no!
That’s not the way, adding fractions gotta’ go!

You need a common, denomin, denominator,
Common, denomin, denominator
Like adding french fries to onion rings!
You need a common, denomin, denominator,
Common, denomin, denominator

And then I had to say,
½ is  2/4
That will work OK.
two quarters and one more,
That just equals three,
Denominators match?
I quickly gave my mother,
¾ of a slice,
She thanked me 20 times,
Said I cut it really nice
Feeling, smart, and proud,
Emotional reactions,
And then I told my mom,

Halves and quarters are different things,
You can’t add french fries to onion rings,

LESSON
When adding ½ of a slice of cake with ¼ of a slice, I needed to find a common denominator.
I know I can replace the ½  with 2/4 because they’re equivalent fractions.
Now all  my fractions are in fourths and have a common denominator of 4… This lets me add them easily- 2/4 plus `¼ mudst be ¾ just like 2 apples plus one apple is 3 apples…
You can see how common denominators help us when adding fractions!

A skateboard to a train,
They’re really very different,  they’re surely not the same…
Oranges and apples,
Are truly different things,
But you can always find the sum of chocolate chips,
And always find the total of a group of groovy grapes,
You can add those things, that make a perfect match,
And when you’re adding fractions that’s the little catch!
When you’re adding fractions denominators match..