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Number calculator online calculator.Welcome to Calc-tools's cross-multiplication calculator, where we'll solve for x with fractions. The expressions we're dealing with here are often called scales, and there's a simple algorithmic way to handle them: cross-multiply fractions. In fact, whatever Which of the four values ​​is unknown, once we cross multiply and divide, we will definitely get our result, no strings attached. But before we get ahead of ourselves, let's slow down a bit and learn how to do cross-multiplication easily and simply. Solving for x with fractions Typically, when we have univariate equations that include fractions, we use cross multiplication. Notice how we include negative numbers or decimals in the numerator or denominator. Also, in the last example, x is outside the fraction, but we follow The basic rules for multiplying fractions make it easy to get it: such equations, even if they look fancy, must follow the same rules as any other. In particular, we can add or subtract any number, and we can multiply or divide any number non-zero value, as long as we do this on both sides of the equals sign. For our purposes, the latter pair of arithmetic operations turns out to be crucial: we'll cross multiply and divide to find the value of x. How to cross multiply fractions The clue is in the name "cross-multiply". We'll take the product of the values ​​in a cross-pattern: left numerator * right denominator = right numerator * left denominator. In fact, that's what solving x with fractions is all about. After all, once we cross-multiply, we don't have fractions, so we can turn to other well-known ones that deal with equations method. For example, if we want to find A from the above formula, it is sufficient to divide both sides by D. Note which letter we need (ie, whether it is the numerator or the denominator), the process is still the same: cross multiply and divide. The difference is The only difference is what we divided by in the second step.