0
Why should you have common denominator when you add two fractions together?
Wiki User
∙ 12y ago
When you have a common denominator, the 2 fractions can be added by simply adding the numerators togethr and keeping the denominator.
It might be harder to visualise this process without first getting a common denominator, thus having it might allow you to have a more accurate answer.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Do you need a common denominator when subtracting fractions?
yes you should use a common denominator when subtracting with fractions, it makes it much easier.
When adding or subtracting fractions what should you do first?
For adding or substracting fractions first of all we should calculate the LCM( Lowest Common Multiplier) of the denominators in both of the fractions.
Why isn't a common denominator needed when multiplying or dividing fractions?
All you need to do to multiply two fractions is multiply the numerators, and multiply the denominators. First converting to a common denominator is possible, and it will indeed give you a correct answer, but it's an unnecessary complication. Not only must you find this common denominator, but it would also cost you additional work to simplify the result.
Which is larger two fifths or three fifths?
Three fifths.Any time you are dealing with like fractions (that is, the bottom number, or denominator, is the same) then the numerator (top number) will determine which is larger, since you are dealing with pieces of the same size. For example, 3/12 is smaller than 9/12, and 7/8 is larger than 3/8.The only time there is really a question of which is larger or smaller is when you are dealing with unlike fractions, which then must be converted to like fractions and thus the comparison becomes clear. For example, "Which is larger, 3/4 or 3/6?" At a glance you should be able to tell that 3/4 is larger, since in this case we are dealing with the same number of pieces, but fourths are larger (in fractions, the larger the denominator, the smaller the piece). However, technically these should be converted to like fractions. Since 12 is the Least Common Denominator between these two fractions, we would convert both to twelfths: 3/4 = 9/12 and 3/6 = 6/12. So now the question becomes, "Which is larger, 9/12 or 6/12?" which can be easily answered -- 9/12 or (in lowest terms) 3/4.* The bottom number of a fraction is called a denominator. It denotes how many pieces into which the whole has been divided (thus the more pieces, the smaller each piece). * The top number of a fraction is called the numerator. It denotes how many pieces of the whole you have.* Like fractions have the same denominator. They can easily be compared, added or subtracted as is (you add or subtract only the numerators). * Unlike fractions (where the denominator is different) must be converted into like fractions (using the Least Common Denominator) and then can be added, subtracted or compared easily. (Although they can be multiplied or divided without conversion.)
What is two and one fourth times ten?
(two and one fourth) times ten = 22.522.5Start by converting both numbers into improper fractions (common denominator is not necessary). You should get 2 1/4 to be 9/4 and 10 as 10/1. Now just multiply across, meaning numerator times numerator and denominator times denominator. You should get 90/4. Reduce it back into a mixed number to get 22 and two fourths, or 22 and a half.
Do you need a common denominator when subtracting fractions?
yes you should use a common denominator when subtracting with fractions, it makes it much easier.
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.
What common denominator would you use to add fractions?
There isn't a universal answer to all problems. What you should try to do is find the lowest common denominator between the fractions you are adding.
In solving a fraction equation John added the numerators of several fractions with unlike denominators. What should John have done first?
John should have first found the lowest common denominator of the given fractions.
John added the numerators of several fractions with unlike denominators what should john have done first?
John has to show the common denominator.
How do you put fractions in order when the denominator is the same?
Actually, fractions go into the order by how large they are. This should actually be easier with a denominator. You know that if they all have the same denominator, that the number with the highest numerator is the largest.
Is 1 over 2 greater than 5 over 10?
I suggest you convert the fractions to a common denominator; that should make it easy to compare them.
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
What is common financial denominator?
The financial statements should be stated in terms of a common financial denominator?
Why would you need to find the GCF and LCM of a set of numbers?
They GCF and LCM are useful in working with fractions: In simplifying a fraction dividing the numerator (top) and denominator (bottom) by the same number reduces the fraction. By dividing through by the GCF of the numerator and denominator the fraction cannot be simplified any further (except converting improper (top heavy) fractions to mixed numbers). For large numbers, it may not be obvious what are the common factors of the numerator and denominator so using a general algorithm to find their GCF makes this easier. When adding or subtracting fractions a common denominator is needed. One number which is guaranteed to work is to multiply all the denominators together. However, this can lead to extremely large numbers which can be difficult with which to work and lead to a fraction that will require simplifying. By using the LCM as the new denominator (hence its alternative name of LCD - Lowest Common Denominator) it ensures the numbers shouldn't get too big and should be easier with which to work.
How do you subtract two fractions with unlike denominators?
Make them into equivalent fractions with the same denominator, then the numerators can be subtracted and the resultant fraction simplified (if possible).The first choice is the denominator for the equivalent fractions. Ideally this should be the lowest common multiple (LCM) of the given denominators, but just multiplying the two given denominators together will do.The fractions can then be made into equivalent fractions with this chosen denominator.If finding the LCM is too difficult, a simple "butterfly" (or "cross multiply") method can be used:multiply the numerator of the first fraction by the denominator of the second fraction as the numerator of the equivalent first fraction;multiply the denominator of the first fraction by the numerator of the second fraction as the numerator of the equivalent second fraction;multiply the denominators together as the denominator of both of the equivalent fractions;subtract the new numerators, keeping the new denominator;simplify the result if possible.eg 3/5 - 1/2 = 3x2/5x2 - 5x1/5x2= 6/10 - 5/10= 1/10eg 5/6 - 1/2 = 5x2/6x2 - 6x1/6x2= 10/12 - 6/12= 4/12= 1x4/3x4= 1/3The same method is used for addition of fractions with different denominators: add instead of subtract the numerators of the equivalent fractions.
How do you divide multiply add subtract fractions?
for subtracting fractions you must find a common denominator. For example 4/6 -1/3 then you must either multiply 1/3 by 2 or divide 4/6 by 2. Id you choose to multiply then you get 4/6 - 2/6 and then you just subtract 4 and 2 and leave the common denominator out of this. the answer to this question is 2, them you add the denominator to make it 2/6. Then you should put it into lowest terms. In this equation you can divide by 2 to get 1/3. To multiply you must cross reduce then multiply the denominator and the numerator. And then you will get you answer
