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How do you rename a pair of fractions with common denominators?

Updated: 9/18/2023

Wiki User

∙ 11y ago

Best Answer

Example: 7/30 + 5/42
Find the LCD by factoring them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
2 x 3 x 5 x 7 = 210, the LCD
30 x 7 = 210
42 x 5 = 210
7/30 x 7/7 = 49/210
5/42 x 5/5 = 25/210
49/210 + 25/210 = 74/210
Simplify if necessary.
7/30 + 5/42 = 37/105

Wiki User

∙ 11y ago

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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. If those numbers are denominators, the LCD is 15.

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Related questions

What does find the common denominator for the fraction pairs mean?

It means find the LCM of the denominators. In order to add and subtract fractions with unlike denominators, it is necessary to convert them to equivalent fractions with a common denominator. Example: 1/4 + 1/6 The LCM of 4 and 6 is 12. 1/4 = 3/12 1/6 = 2/12

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The Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. I assume the 7 and 21 are the denominators of two fractions you need to add or subtract.LCD(7, 21) = 21.

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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.

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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.

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