Adding and Subtracting Fractions Video (MV)

Yeah
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 of 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
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 smells so good, we had to give it a sniff
The LCM was twenty, the new denominator
We found equivalence quickly
Ten-twentieths plus four-twentieths
Fourteen-twentieths of a pizza at the pizzeria
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
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
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