57 Divided by What 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 can we divide 57 by to equal 81?
Solving 57 Divided by What Equals 81
Here’s how you would set up this question as an equation:
57
x
=
81
\frac{57}{x} = 81
x 57 = 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, it can be done in two steps. The first step is to multiply both sides by x to isolate 57:
57
=
81
∗
x
57 = 81*x
57 = 81 ∗ x
Then we can isolate x on the right side of the equation by dividing both sides by 81:
57
81
=
x
\frac{57}{81} = x
81 57 = x
When we simplify the new equation, we can solve for x. In this example, we will round to the nearest three decimal places if that’s needed.
x
=
0.704
x = 0.704
x = 0.704
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 40 equals 49?
3 divided by what equals 96?
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What is 16/5 divided by 6/10?
What is 1 divided by 7/3?