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You have to make a common denominator between them, otherwise you can't. See if they have similar factors, or if you can't find any easily, cross-multiply and multiply the numerator and denominator of one side by the denominator of the other side and do the same thing to the other side with the denominator of the other fraction!
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoTo add fractions they must have the same denominator.
If the denominators are different, you need to find a new denominator that is a common multiple of all the denominators and make all the fractions equivalent fractions with this new denominator; then you can add the fraction by adding together the numerators (and simplifying the result).
Ideally using the Lowest Common Multiple (LCM) of the denominators will keep the new numerators smaller.
If you cannot find the lowest common multiple, a simple solution is to multiply all the denominators together and use this as the new denominator.
For two fractions, using this gives a trick that always works:
The new denominator is the two denominators multiplied together.
The new numerator is the numerator of the first fraction multiplied by the
denominator of the second plus the denominator of the first multiplied by the numerator of the second:
eg 3/5 + 2/7 = (3 x 7) + (5 x 2)/(5 x 7)
= (21 + 10)/35
= 31/35
If you have more than two fractions, you can add the first two together using this trick, then add the result of this and the next fraction together, and so on until all the fractions have been added.
When doing this you can simplify as you go, keeping any improper fractions; if the final result is an improper fraction, it can be converted into a mixed number.
Look at the two (or three) common denominators,
find a number they all multiply into (e.g. something that they can all be divided by repeatedly and in the end turn into "1")
multiply everything by that number, including top halves of fractions,
Add your answer:
Earn +20 pts
How do you add a dissimilar fraction?
By finding their lowest common denominator
How do you add and subtract fractions with unlike denominators without finding a common denominator?
The fastest and surest way to do that is to have a calculator that has a fraction button. (a b/c)
How do you add a negative fraction to a mixed fraction?
To add a negative fraction to a mixed fraction, first convert the mixed fraction to an improper fraction. Then, find a common denominator for both fractions. Next, add the numerators and keep the common denominator. Finally, simplify the resulting fraction if needed. If the negative fraction has a smaller absolute value than the mixed fraction, you may need to borrow or regroup to ensure proper subtraction.
How to add integers with fraction?
I believe it's the LCD, or least common denominator, and continue from there.
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 do you add a dissimilar fraction?
By finding their lowest common denominator
What is 16 and one sixth as a fraction?
To convert a mixed fraction to an improper fraction: Multiply the whole number by the denominator, and add the numerator. This will be the numerator of the result. Copy the denominator without changes to the denominator of the result.
How do you add and subtract fractions with unlike denominators without finding a common denominator?
The fastest and surest way to do that is to have a calculator that has a fraction button. (a b/c)
How do you add a negative fraction to a mixed fraction?
To add a negative fraction to a mixed fraction, first convert the mixed fraction to an improper fraction. Then, find a common denominator for both fractions. Next, add the numerators and keep the common denominator. Finally, simplify the resulting fraction if needed. If the negative fraction has a smaller absolute value than the mixed fraction, you may need to borrow or regroup to ensure proper subtraction.
Why if there are two fraction having different denominator are you are going to find first their least common denominator?
To get the right answer when you add or subtract them.
How to add integers with fraction?
I believe it's the LCD, or least common denominator, and continue from there.
How do you add fractions without the same denominator?
Find the LCM of the denominators. Example 1: 1/4 + 2/3 The LCM of 3 and 4 is 12, so the common denominator is 12. Convert each fraction to 12ths and add. Example 2: 1/8 + 5/6 The LCM of 6 and 8 is 24, so the common denominator is 24. Convert each fraction to 24ths and add.
How do you change a common fraction to an improper fraction?
Multiply the denominator times the whole number and add the product to the numerator. That number is then the numerator while the denominator remains the same.
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 do you subtart fractions?
subtract? Find a common denominator (LCD is preferred). Convert each fraction to an equivalent fraction with the LCD. Add numerators, keep LCD as new denominator. Reduce the fraction.
Do you add the denominator in a fraction?
no.
How do you add miked numbers in fraction?
Convert them to improper fractions, find a common denominator and proceed.
