What Divided by 81 Equals 1?
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 81, equals 1?
Solving What Divided by 81 Equals 1
Here’s how you would set up this question as an equation:
x
81
=
1
\frac{x}{81} = 1
81 x = 1
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 81, resulting in this equation:
x
=
1
∗
81
x = 1*81
x = 1 ∗ 81
Then we simplify and find our answer:
x
=
81
x = 81
x = 81
So, the answer to the question “What divided by 81 equals 1?” is 81.To prove this, we can take the original problem:
x
81
=
1
\frac{x}{81} = 1
81 x = 1
And insert 81 in the place of x:
81
81
=
1
\frac{81}{81} = 1
81 81 = 1
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!
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44 divided by what equals 46?
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What is 17/2 divided by 18/5?
What is 45 divided by 10/19?