Best Answer

get them to have the same demoninator. like if you have 5/6-3/4 make it 10/12-9/12. then just subtract.

Q: How do you subtract fractions with unlike denminators?

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no, to add and subtract like and unlike fractions the denominator has to be the same,

Finding the LCM will make adding and subtracting fractions easier.

first find a common denominator then subtract the top numbers

To add and subtract unlike fractions.

When you want to add or subtract unlike fractions.

because its just one of the rules of math :)

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

To get the right answer when you add or subtract unlike fractions.

Because to add fractions, the denominators must be equal.

Equivalent fractions, e.g. 1/2 = 2/4 = 3/6, etc.

-1/2+7/10

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