Lyrics – GCF

By Daniel Joseph Duey

Greatest Common Factor / Least Common Multiple

Verse1
Greatest common factor, least common multiple, use a prime
factorization tree to solve them both. Although you might not
know, prime factorization tree I’ll take it slow so here we go.
What’s a prime number before we move on? A number that only
divides by itself and 1. I said what’s a prime number before we
move on? A number that only divides by itself and 1, done. For
are first factorization tree, lets start off with the number 15. 15’s
not prime, no, you see, because 15 can be divided by 5 and 3 and
5 and 3 are prime numbers to me. So put the 5 times 3 on the
line of the tree and the tree is the first of 3 steps. Let me take a
breath, play the chorus and I’ll teach you the rest.

Chorus
What’s up next to teach? Greatest common factor.
Do it to it Mr. Duey ‘till we learn to master…
Factor trees take the prime number in common with each
Multiple them up and you’ll see the greatest common factor.
Greatest common factor known as GCF.

Verse 2
Pair off the numbers in common until there is none
left and for each pair of prime numbers write one down on the line.
Then, multiply them on up and that’s how you find.
Now that’s fine to memorize for a quiz
but I’m going to try to teach a problem for this, and the problem
let’s take 30 and 6 cause 30 and 6 I don’t know it flows with the
mix. Now check it out. 6 divides by 3 and 2 and 3 and 2 are
prime numbers so the 6 is through. With 30 there’s a little work to
do the factor 3 times 10 is the route I’ll choose. Now the 3 that’s
prime but the 10 factor down and the factors of 10 are 2 and 5 so
for 30 you have 3 times 2 times 5. Alright, now it’s time for the
last step. Pair off the prime numbers till there is none left and the
numbers 3 and 2 should be on the line. Then multiply them on up
and 6 is what you find.

Chorus
What’s up next to teach? Greatest common factor.
Do it to it Mr. Duey ‘till we learn to master…
Factor trees take the prime number in common with each
Multiple them up and you’ll see the greatest common factor.
Greatest common factor known as GCF.

Bridge/Outro

The class is not over. We still need to talk about least common

multiple. So I’m going to take it out with the bridge. Listen.

Least common multiple, the same as GCF except you multiply the

rest of the prime numbers left, least common multiple. You

multiply with the rest of the prime numbers left, left, left.