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Why do you need you need to have a common dinominator before you add or subtract them?
Wiki User
∙ 13y ago
What do you get when you add 1/2 and 1/4 ?
You can't even do that simple addition without first changing both fractions to
something common, even if you do it in your head and do it so fast that you
don't realize you're doing it.
The only answer to the question is simply: There's no way to add or subtract fractions
if they don't have the same denominator, and if you do, then you get the wrong answer.
Wiki User
∙ 13y ago
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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 add and subtract fractions in math?
You need common denominators. Then add or subtract the numerators. If the answer is an improper fraction it is common practice to reduce it to a mixed number.
How do you subtract fractions in simplest form?
You first need to find a common denominator, not necessarily the least common denominator. Next, you rename the fractions according to the common denominator. Only then can you subtract the fractions. After subtraction you should simplify the answer.
Why do you need to find a common denominator before you can add or subtract fractions with unlike denominators?
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.
What is 6.3x-88.2 commond dinominator and in simplest form?
94.5
When do you need a common denominator?
The denominators must be the same before you can add or subtract fractions.
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 to have common denominator before you add or subtract them simple answer pleas?
So that you only have to add/subtract the numerator which makes it much easier.
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.
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.
What you need to add or subtract fractions?
You need a common denominator in order to add or subtract fractions.
Why do you need to have a common denominator before you subtract or add them?
Because addition and subtraction are defined in terms of like terms.
How do you subtract two fractions?
You have to find a common denominator, multiply them, subtract them and then simplify if you need to.
Which is the least common dinominator of 12115?
You need at least two numbers to find an LCD. If that's 12 and 115, the LCD is 1380. If that's 121 and 15, the LCD is 1815.
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.
How do you add and subtract fractions in math?
You need common denominators. Then add or subtract the numerators. If the answer is an improper fraction it is common practice to reduce it to a mixed number.
Why do you need to use common denominator?
To get the right answer when you add or subtract unlike fractions.
