Two-Step Equations Using Multiplication/Division
This video helps you tackle two-step equations with multiplication and division by using the opposite operation on each side of the equation. Definitely less scary than laser sharks!
|Basic Operations||Multiplication and Division|
Can you determine how many sharks Dr. Villain had before his Jamaican getaway?
As always, we'd like to have a formula to help us solve the problem.
So we first need to determine the variable.
Because we're trying to figure out the original number of sharks, we're going to substitute
that value with x. In the beginning, there were x number of sharks.
Then half were eaten by flesh-eating bacteria. We'll write that as x over 2.
Guess someone should have washed their hands a little better.
Then Bill ate three of the sharks, so we'll subtract 3.
We know there was only one shark left, so we can put 1 to the right of the equals sign.
Our goal is to get x all by itself on one side. So let's first get rid of that pesky
We can do that by using the opposite operation and adding 3 to both sides.
Remember to always perform the same operation on both sides; Dr. Villain is fair that way.
Now we have x divided by 2 equals 4.
While we can't undo the near-extinction of the laser-shark, we can undo x being divided
by 2... by multiplying 2 to both sides. And there you have it, Villains and Man-Servants:
x equals 8.
Which means the original number of laser-sharks totaled 8.
Hey there, turn that frown upside down, Dr. Villain.
You may only have one laser-shark left. But even a sad, friendless laser-shark is still
a laser shark!
Just remember that, in the future, you might want to hire better help...preferably someone
who doesn't have a taste for laser shark.