Question

when should we use cross multiplication in fraction


please tell answer for 7 th class student​

Answer 1

Cross multiply only when you need to determine if one fraction is greater than another, or if you are trying to find a missing numerator or denominator in equivalent fractions.

Answer 2

When cross multiplying fractions, the name sort of hints at how this is actually done.

You literally multiply across. Let’s say you have two fractions that are set equal to each other. So let’s say, 

a/b=c/d

Well, to cross multiply them, you multiply the numerator in the first fraction times the denominator in the second fraction, then you write that number down. Then you multiply the numerator of the second fraction times the number in the denominator of your first fraction, and you write that number down.

The reason we cross multiply fractions is to compare them. Cross multiplying fractions tells us if two fractions are equal or which one is greater. This is especially useful when you are working with larger fractions that you aren’t sure how to reduce.

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