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It's the same process as finding least common multiples.

Example: 1/30 and 1/42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Combine the factors, eliminating duplicates.

2 x 3 x 5 x 7 = 210, the LCD

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Q: How do you identify what common denominator to use-?
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Related questions

How do you identify the common denominator?

The common denominator for a set of numbers is identified by simply multiplying the numbers together. This will not be the least common denominator, but that is not what the question is about.


Do you have to find the lcd when comparing them or can you use any common denominator?

For the sake of comparison, any common denominator will do.


What is the common denominator of 56 and 7?

A common denominator is 7.A common denominator is 7.A common denominator is 7.A common denominator is 7.


What is halfway between 1 over 4 and 1 over 2?

Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.


How do you use least common denominator in a sentence?

the least denominator is the bottom number of a fraction that u use the least


What ingredients are in adding fraction?

If you mean the steps, they are as follows:* Identify a common denominator. Any common denominator will do. * Convert both fractions to equivalent fractions, with the common denominator found in the previous step. (If the fractions start off with the same denominator, there is nothing else to do in these first two steps.) * Add the numerators. That's the numerator of the result. Copy the common denominator as the denominator of the result. * Check whether you can simplify the resulting fraction.


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 find the least common denominator of a set of unlike fractions?

To find the least common denominator of a set of unlike fractions, you first need to list the prime factors of each denominator. Then, identify the highest power of each prime factor that appears in any of the denominators. Finally, multiply these highest powers together to find the least common multiple, which will be the least common denominator for the fractions.


What is the least common multiple of two ir more denominators?

That's the least common denominator or LCD.


What are the least common multiple of a denominator called?

The least common denominator.


How do you flowchart greatest common denominator?

Just use the GCF(greatest common factor


What is a synonym for common denominator?

A few synonyms for common denominator are , common divisor, common measure, denominator, numerator