Q: Why do you need to find a common denominator before you can add or subtract fractions with unlike denominators?

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No, the denominators have to be the same.

First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators

convert both to numbers with lowest common denominator then add

because it would be diffcult to understand.[you don't add or subtract the demonters]

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.

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The denominators must be the same before you can add or subtract fractions.

Common Denominator means that the denominators in two (or more) fractions are common, or the same. The common denominator is important because before you can add or subtract fractions, the fractions need to have a common denominator.Sometimes fractions have different denominators, like 2/3 and 3/4. If you want to add or subtract them, they need to have the same denominator. In order to do that, you find a common denominator which is the same thing as a common multiple, only with denominators.

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

No, the denominators have to be the same.

First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators

You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.

convert both to numbers with lowest common denominator then add

Because the answers will be wrong when adding or subtracting them if they don't have a common denominator.

because it would be diffcult to understand.[you don't add or subtract the demonters]

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.

When you have fractions with unlike denominators, it is necessary to find a common denominator before you add or subtract them. The process is the same as finding an LCM, but since the numbers are denominators, we call it the least common denominator. Example: 1/3 + 1/4 The LCM of 3 and 4 is 12. 1/3 = 4/12 1/4 = 3/12 1/3 + 1/4 = 7/12

you gotta find tyhe width of they nile river and substiture into the cosine rule before dividing by the velocity of the amazon rainforest