Cross multiplication
Calculator and formulas for calculating the cross multiplication
Cross multiplication is a method of elementary arithmetic to calculate the value of a variable in an equation involving two fractions or rational expressions (Not to be confused with Cross product).
To perform the calculation, enter the values of the varibles, then click the 'Calculate' button.
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Formula and example
The formula for the cross multiplication consists of two pairs of values that are related to each other.
\(\displaystyle a/b=c/x\) or \(\displaystyle\frac{a}{b}=\frac{c}{x}\)
The formula is changed for the calculation:
\(\displaystyle x=\frac{b ·c}{a}\)
Example
If 4 pears cost 2 euros, how much do 6 pears cost?
\(\displaystyle 4/2=6/x\) or \(\displaystyle\frac{4}{2}=\frac{6}{x}\)
\(\displaystyle x=\frac{2 ·6}{4} = 3\)
Absolute Change
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All divisors of an integer
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Average
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Binomial formulas
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Common divisors of two integers
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Consecutive integers
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Cross multiplication
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Diamond problem
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Digit sum
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Digital root
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Direct variation
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Division with remainder
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Elementary arithmetic
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Factorial
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FOIL Method
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Inverse cross multiplication
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Inverse modulo
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Greatest common divisor
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Least common multiple
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Modulo
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Multiplicative inverse
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Relative Change
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