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# Adding & Subtracting Fractions Song

In a future time, when AI robots have taken over running pizzerias on a planet orbiting Alpha Centauri, the robot Zigon takes orders and then adds and subtracts fractions before the Pizzamatic-5000 serves up large pepperoni and cheese pizzas for its alien visitors! Adding Fractions has never been so stellar or astral.

If you like our math joke located on the top right of this page, scroll down and steal it! We made it easy for you. (and, of course, you have our permission)

#### Song Lyrics:

This is how the least common multiple’s found:
write a list of each denominator’s multiples down;
the smallest number you can find in both of them
is the least common multiple (a.k.a. the LCM.)

The least common multiple can also be
called the least common denominator - or LCD.
It stays the same in the difference or the sum
when you subtract or add two fractions.

Three-sixths of a pizza minus one-fourth:
find the LCM, which is twelve, of course.
(Twelve is the least common denominator.)
Make equivalent fractions (six-twelfths and three-twelfths).
Then, do the subtraction: six minus three is three...
three-twelfths of a pizza at the pizzeria.

Chorus:
Find the least common multiple; that’s the first action.
Next, is finding equivalent fractions.
Then, do the addition or subtraction.
Simplify like an automatic reaction.

Two-fourths of a pizza plus one-fifth:
it smelled so good we had to give it a sniff.
The LCM was twenty (the new denominator).
We found equivalents quickly: ten-twentieths plus four-twentieths... fourteen-twentieths of a pizza at the pizzeria.

(Chorus)

Five-sixths of a pizza minus one-third:
I knew the LCM was six, and have you heard?
It’s also called the least common denominator.
I found equivalent fractions (five-sixths and two-sixths).
Then, I did the subtraction: five minus two is three...
three-sixths of a pizza at the pizzeria.

(Chorus) 