Accepted Solution
To calculate a numerical division problem where one of the numbers is unknown, you can follow this guide with an equation as an example: "81 divided by what equals 90?". This kind of problem often indicates that we're working with a variable, usually represented in math as "x". In this example, our problem becomes determining the value of "x" that makes the equation "81 divided by x equals 90" true.
Setting the equation as \(\\frac{81}{x} = 90\), the goal is to isolate x. To achieve this, we need to re-arrange the equation with x alone on the right side. The first step to doing this is to multiply both sides by x which then gives us \(81 = 90x\). To further isolate x, we divide both sides of the equation by 90 which gives us \(\\frac{81}{90} = x\). After simplifying this equation, the solution for x would be approximately x = 0.900, when rounded up to three decimal places.
If you wish to further enhance your understanding, try practicing with similar problems such as the ones provided below: