Best Answer

Find the LCM of the denominators.

Example: 1/30 and 1/42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the highest amount of each factor.

2 x 3 x 5 x 7 = 210, the Least Common Denominator.

1/30 = 7/210

1/42 = 5/210

Q: How do you get common denominators?

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Related questions

Common multiples and common denominators can be found using the same process. They differ in their function. Common denominators are common multiples that are functioning as denominators.

Common denominators are common multiples of two or more denominators.

Denominators which have no common factors

The least common denominator is the least common multiple of the denominators.

multiply the denominators

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.

The least common multiple of the denominators is knows as the LCD or least common denominator.

Multiply them by each other.

Denominators. This is where the term, common denominators comes from.

Common denominators are created by finding the common multiples of unlike denominators.

You have to state the denominators to expect an answer

Common denominators are common multiples that are being used as denominators.