No you only cross multiply when your working with percent
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Cross multiplication is when you multiply the denominator of a fraction by the numerator of another fraction. Before you cross multiply you want to see if you can simply the fractions.
cross multiply and the fraction with the largest total is a greater fraction
Multiply the numbers ignoring the signs and then add a negative sign.
When you have a fraction on each side of the equals you can multiply the denominator of the left side times the numerator of the right. It will equal the product of the numerator on the left side times the denominator of the right. That is called cross products.
If doing it without a calculator, then convert each mixed fraction into a top-heavy equivalent fraction and then multiply as for fractions.