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Q: Why do fractions need to have unlike denominator before you add or subtract them?

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

first find a common denominator then subtract the top numbers

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

Before you can add or subtract, both fractions must have the same denominator, andmaking that change without changing the value of either fraction is your job. The bestchoice for a 'common' denominator is usually the least common multiple of the originaldenominators.

Like fractions are the fractions which have the same denominator and unlike fractions are the fractions which do not have the same denominator.

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

"Unlike" fractions.

Like fractions have the same denominator, unlike fractions don't.

When those two numbers are the denominators of unlike fractions, finding the LCM (in this case, the LCD or least common denominator) and converting the unlike fractions to equivalent fractions with the same denominator will allow you to add and subtract them.

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

In order to add or subtract one fraction from another, they must have a common denominator, or the same denominator. That's because it's impossible to add two fractions that have a different number of parts.

Find the lowest common denominator

You look for a common denominator; convert the fractions to equivalent fractions with the denominator you found; then you do the addition itself.

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That depends what kind of calculation you want to do with the fractions.

The fastest and surest way to do that is to have a calculator that has a fraction button. (a b/c)

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. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

When adding and subtracting unlike fractions, it is necessary to find the LCM of the denominators, called the least common denominator. Once you have found the LCD, you can convert the fractions to equivalent fractions with a common denominator and proceed with the adding and/or subtracting. Finding an LCM will have no effect on multiplying fractions.

If you are adding or subtracting unlike fractions, convert them to equivalent fractions with a common denominator.

Knowing the LCM of the denominators will help you to find a least common denominator of unlike fractions, which will allow you to add and subtract them successfully. Knowing the GCF and LCM will not help you in multiplying them, but knowing the GCF of the numerator and denominator of a fraction will help you reduce it if necessary.

You first convert them to equivalent fractions with a common denominator. Or you convert them to decimal fractions.

To add and subtract unlike fractions.

When you want to add or subtract unlike fractions.

When adding and subtracting unlike fractions, it is necessary to find a least common denominator. It's the same process as finding an LCM. You can simplify a fraction by finding the GCF of the numerator and denominator and dividing them both by it.

because its just one of the rules of math :)