0
Why do fractions need a common denamator when substrating them?
Wiki User
∙ 10y ago
To get the correct answer. If you look at a problem like 1/3 - 1/4, you might not be able to guess the answer is 1/12 unless you know that 1/3 = 4/12 and 1/4 = 3/12
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
How do you get the common denominator for dividing fractions?
You don't need a common denominator to divide fractions.
Do you need common denominators when subtracting fractions?
Yes. You need common denominators if you want to:Add fractionsSubtract fractionsCompare fractions ("which is larger?")You do not need common denominators to multiply or divide fractions. Thus, in the case of fractions, multiplication and division is actually easier than addition and subtraction.
Do you need a common denominator for dividing fractions?
No only when adding or subtracting fractions a common denominator is needed
Do you need a common denominator multiplying fractions?
No.
Does division need a common denominator?
No, You only need a common denominator when adding or subtracting fractions.
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.
How do you get the common denominator for dividing fractions?
You don't need a common denominator to divide fractions.
What you need to add or subtract fractions?
You need a common denominator in order to add or subtract fractions.
Do you need common denominators when subtracting fractions?
Yes. You need common denominators if you want to:Add fractionsSubtract fractionsCompare fractions ("which is larger?")You do not need common denominators to multiply or divide fractions. Thus, in the case of fractions, multiplication and division is actually easier than addition and subtraction.
Do you need a common denominator for dividing fractions?
No only when adding or subtracting fractions a common denominator is needed
How is subtracting fractions like adding fractions?
You need a common denominator for both.
Do you need a common denominator to multiply fractions?
No.
Do you need a common denomaitor when you multiply fractions?
No.
Do you need a common denominator when multyplying fractions?
No.
Do you need a common denominator multiplying fractions?
No.
Does division need a common denominator?
No, You only need a common denominator when adding or subtracting 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.
