0
Why do you need to find a common denominator before you can add or subtract fractions with unlike denominators?
Wiki User
∙ 11y ago
Because if you skip that step . . .
-- you'll need to invent your own method for adding fractions with different
denominators, because every method you'll ever be taught or find on your own
requires common denominators,
and
-- the answer you get will be wrong.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Do you always have to have like numerators in fractions before you can add or subtract?
No, the denominators have to be the same.
How do subtract two fractions with different denominator?
First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators
When asked to find the sum of two mixed numbers with different denominators you should before you add.?
convert both to numbers with lowest common denominator then add
Why do fractions need to have a common denominator before add or subtract them?
because it would be diffcult to understand.[you don't add or subtract the demonters]
How do you subtract fractions with unlike?
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 do you need a common denominator?
The denominators must be the same before you can add or subtract fractions.
Why do you need a common denominator?
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.
Why do fractions need to have unlike denominator before you add or subtract them?
The question is based on a complete misunderstanding of what is required. Unlike denominators are NOT required!
Do you always have to have like numerators in fractions before you can add or subtract?
No, the denominators have to be the same.
How do subtract two fractions with different denominator?
First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators
Do you need a common denominator for all fractions before doing the order of operations?
You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.
When asked to find the sum of two mixed numbers with different denominators you should before you add.?
convert both to numbers with lowest common denominator then add
Why do fractions need to have a common denominator before add or subtract them?
because it would be diffcult to understand.[you don't add or subtract the demonters]
Why do fractions need a common denominator before you add or subtract?
Because the answers will be wrong when adding or subtracting them if they don't have a common denominator.
How do you subtract fractions with unlike?
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.
How can finding the least common multiple of two numbers help you add fractions?
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
How do you get a common denominator for subtracting fractions?
you gotta find tyhe width of they nile river and substiture into the cosine rule before dividing by the velocity of the amazon rainforest
