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Do you change both numerators if you HAVE TO FIND common denomarator?
Wiki User
∙ 11y ago
Only if the LCD is different from the others. If you were adding 1/5 to 1/10, you wouldn't have to change the numerator of 1/10 since 10 is the LCD. But if you're adding 1/5 + 1/7, you have to change both numerators since the LCD in that case is 35.
Wiki User
∙ 11y ago
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Find the LCD then add or subtract?
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 :)
How do you get the common numerator for 3 fractions?
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.
How do you find the greatest common factor when there are no common factors?
There is always a common factor. If there are no common prime factors, the GCF is 1.
What is the greatest common factor of 240 is?
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.
How do you find 3 common multiple and factors of 350?
It's impossible to find something in common for a single number. You need at least two.
How do you order dissimilar fractions?
Find a common denominator, put the numerators in order.
How do you subtract a fraction?
Find a common denominator (make sure you multiply BOTH the numerator and the denominator) then subtract the numerators and simplify if necessary.
How do you add three fractions with unlike denominators?
-- 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.
How do you find the leaset common denominator?
By finding the lowest common multiple of the different denominators then rearranging the numerators and denominators accordingly.
How do you add multiple mixed fractions?
Find a common denominator, add the numerators, simplify if possible.
How do you find inverse function?
If its a fraction then we can change the numerators and denominators upside down .This is in case of fraction.
Can you add numbers with different numerators?
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).
Is it always necessary to find the least common denominator to compare the sizes of fractions?
When comparing fractions you must find a common denominator; by finding the least common denominator it will keep the numbers (numerators and denominator) smaller .
How do you explain the steps of a fraction equation by adding?
First find a common denominator. Then, add the numerators together. Simplify if possible.
How do you add fractions in 6th grade math?
Find a common denominator between the two and then add the numerators. FInally simplify.
How do you compare 3 or more fractions?
Find the equivalent fractions with the same denominator (the least common multiple) and then compare the numerators.
How do you subtract and simplify fractions?
find a common denominator. multiply the top and bottom by it. then you can combine the numerators over the same denominator
