Did you notice where we used the word systematic to describe that step-by-step way of doing cross-cancellation? Some people probably ignored that word, and some other people might have wondered what it meant, and had a sinking feeling that we’re using fancy words, and things might soon stop making sense. Multiply all factors on the top of both fractions to form the numerator of the answer, and multiply all factors on the bottom of both fractions to form the denominator of the answer.ĭo you always have to do all that? No, not always.Repeat the previous step on the other diagonal. ![]() If multiple copies of any factor are present, deal with them by canceling only as many copies as are present in the opposite location (the same as when simplifying fractions). In fact, it’s because these factors are located diagonally from each other, that we call it cross-cancellation.
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