Q: Do you change both numerators if you HAVE TO FIND common denomarator?

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To add or subtract fractions the denominators must be the same - then the numerators are added or subtracted with the denominator being kept the same.When adding or subtracting fractions with different denominators, the fractions must first be converted into equivalent fractions with the same denominator and then the (new) numerators can be added or subtracted as required.For the denominator for these equivalent fractions, the original denominators can all be multiplied together, but this can lead to having to work with very large numbers; a better choice for the denominator is the smallest number that all the denominators divide into, their Least Common Multiple (LCM) - this is is then used as the denominator for the equivalent fractions and is called the Least Common Denominator (LCD) of the fractions.First you find the LCD okay??? Then you have to add or subtract. What they mean by that is that once you've found your lcd add or subtract..xx hope i helped :)

I'm not sure why you'd want to. You would get a common numerator of three fractions by finding the LCM of the numerators, but you would still have to find the common denominator to do anything with them. Assuming that's what you meant in the first place, you find a common denominator by finding the LCM of the denominators. Example: 1/3, 2/5, 5/6. The LCM of 3, 5 and 6 is 30. 1/3 = 10/30 2/5 = 12/30 5/6 = 25/30 Now you can add or subtract them however you'd like.

There is always a common factor. If there are no common prime factors, the GCF is 1.

There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.

It's impossible to find something in common for a single number. You need at least two.

Related questions

Find a common denominator, put the numerators in order.

Find a common denominator (make sure you multiply BOTH the numerator and the denominator) then subtract the numerators and simplify if necessary.

By finding the lowest common multiple of the different denominators then rearranging the numerators and denominators accordingly.

-- Find a common denominator. (It will be a number of which all three denominators are factors. The best choice is their least common multiple.) -- Change the fractions to their equivalents with the common denominator. -- Then add their numerators to get the numerator of their sum.

To multiply mixed fractions would be as to change any to being improper, then back to mixed afterwards. Then all of the fractions would need to have the same denominator. An example could be as: 1 1/2 x 1 1/4 = (4/4 + 2/4) x (4/4 + 1/4) = 6/4 x 5/4 = 30/4 = (30/2)/(4/2) = 15/2 = 14/2 + 1/2 = 7 1/2.

If its a fraction then we can change the numerators and denominators upside down .This is in case of fraction.

Yes, 'fractions' with different numerators can be added, but not with different denominators. In the case where you have different denominators, you must find the LCM (lowest common multiple).

When comparing fractions you must find a common denominator; by finding the least common denominator it will keep the numbers (numerators and denominator) smaller .

find a common denominator. multiply the top and bottom by it. then you can combine the numerators over the same denominator

First find a common denominator. Then, add the numerators together. Simplify if possible.

Find a common denominator between the two and then add the numerators. FInally simplify.

Find the equivalent fractions with the same denominator (the least common multiple) and then compare the numerators.