What Divided by 5 Equals 81?
Methods
Setting up the problem:
In a problem like this, the “what” means that we’re working with a variable. The most common variable used in math is “x”. So, we could say what number, x, when divided by 5, equals 81?
Solving What Divided by 5 Equals 81
Here’s how you would set up this question as an equation:
x
5
=
81
\frac{x}{5} = 81
5 x = 81
The goal of the problem is to solve for x. To do this we need to change the equation so that x is alone on one side of the equation.In this case, we can do that by multiplying both sides of the equation by 5, resulting in this equation:
x
=
81
∗
5
x = 81*5
x = 81 ∗ 5
Then we simplify and find our answer:
x
=
405
x = 405
x = 405
So, the answer to the question “What divided by 5 equals 81?” is 405.To prove this, we can take the original problem:
x
5
=
81
\frac{x}{5} = 81
5 x = 81
And insert 405 in the place of x:
405
5
=
81
\frac{405}{5} = 81
5 405 = 81
Because this is true, the answer must be correct.
Practice Other Division Problems Like This One
If this problem was a little difficult or you want to practice your skills on another one, give it a go on any one of these too!
What divided by 55 equals 99?
6 divided by what equals 34?
What is 18/1 divided by 61?
What is 16/20 divided by 14/12?
What is 36 divided by 17/6?