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Q: How do you add and subtract unlike denominators?

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Because to add fractions, the denominators must be equal.

just change the fration with the smallest denominator and add or subtract the way you always do.

The question is based on a complete misunderstanding of what is required. Unlike denominators are NOT required!

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convert at least one of them so that they have the same denominator, then proceed with the addition or subtraction

It will enable you to add and subtract fractions with unlike denominators.

The same way you would add or subtract whole numbers, leaving the denominators alone.

The denominators need to be the same for subtraction. Find the Least Common Denominator for both items and then subtract.

Convert unlike fractions to equivalent fractions with common denominators by finding the LCM of the denominators.

If the fractions have the same denominator, add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible. If the fractions have different denominators, find the LCM of the denominators and convert the fractions to equivalent fractions with like denominators. Then add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible.

In fractions, you can NEVER add or subtract

Whether the denominators are common or not.

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