Q: What is the definition of adding and subtracting fractions with unlike denominators?

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Not always but they need to have the same denominators when adding or subtracting them.

Yes. When multiplying and dividing fractions your denominators do not have to be the same. The denominators only haveto be the same if you are subtracting or adding them.

The denominators must be the same, the numerators can be different.

When adding or subtracting fractions first make sure that the denominators are the same if they aren't then find the lowest common denominator and alter the fractions accordingly

For adding or substracting fractions first of all we should calculate the LCM( Lowest Common Multiplier) of the denominators in both of the fractions.

Related questions

When adding or subtracting fractions their denominators must be the same

Ensure that the denominators are the same when adding or subtracting fractions.

Not always but they need to have the same denominators when adding or subtracting them.

I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.

Yes. When multiplying and dividing fractions your denominators do not have to be the same. The denominators only haveto be the same if you are subtracting or adding them.

You cannot add or subtract fractions with different denominators. If the denominators are different then you need to work with equivalent fractions.

A common denominator is needed when adding or subtracting fractions of different denominators.

Making sure the denominators are the same.

When adding or subtracting fractions with different denominators and when reducing fractions to their lowest terms

When adding or subtracting fractions with different denominators their lowest common denominator must be found first by using the LCM of their denominators

The denominators must be the same, the numerators can be different.

common denominators.