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Q: How do you find unknown denominators?
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How do you find out a fraction if it is subtracted by different denominators?

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

What way is subracting fractions with unlike denominators like adding fractions with unlike 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.

How can you get a dcommon denominator?

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

Where to find common denominators?

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

Do you find common denominators when you multiply fractions?


How will you find the value of the unknown in a given rational equation?

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

When you add or subtract fractions with unlike denominators why do you have to find LCM?

Because to add fractions, the denominators must be equal.

When you subtract fractions do you subtract the denominator?

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

How do you find the leaset common denominator?

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

Explain how comparing fractions with like denominators differs from comparing fractions with unlike denominators?

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

How are common multiple and a common denominator alike and different?

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

How is finding the LCM revelant when adding and subtracting fractions?

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.