Q: How do you find unknown denominators?

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You can multiply the two denominators, or you can find the least common multiple for the two denominators.

Try to cross multiply if possible or set the denominators equal to each other Cross multiplying is when a/b = c/d Which is equal to ad = bc

No. If the denominators are the same, you subtract the numerators. If the denominators are different you have to find the least common denominator.

By finding the lowest common multiple of the different denominators then rearranging the numerators and denominators accordingly.

You have to make the fractions equivalent, which means you need to find the lowest common factor that goes into both the denominators.

Related questions

You find the least comon multiples of the fractions' denominators.

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.

You can multiply the two denominators, or you can find the least common multiple for the two denominators.

Multiply any two denominators together. Their product will be a common denominator of them both.

No.

Try to cross multiply if possible or set the denominators equal to each other Cross multiplying is when a/b = c/d Which is equal to ad = bc

Because to add fractions, the denominators must be equal.

No. If the denominators are the same, you subtract the numerators. If the denominators are different you have to find the least common denominator.

By finding the lowest common multiple of the different denominators then rearranging the numerators and denominators accordingly.

Because when you compare fractions with the same denominators, you do not have to find the least common denominator (LCM or LCD).

Common denominators are multiples that are being used as denominators. The process to find them is the same.

To add and subtract fractions, you need common denominators. To find the common denominator, find the LCM of the denominators you wish to add or subtract.