Q: What is a common denominator for 7 and 5?

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It is: 133

1/5 + 1/7 = 12/35. TO solve, find the least common multiple or lesta common deonominator fo 5 and 7. The answer is 35. Now convert the fractions into those with a common denominator. 1/5 * 7/7 = 7/35 1/7 * 5/5 = 5/35 Now, (7+5) / 35 = 12/35, which is in simplest form.

To get the correct answer. If you were adding 1/5 and 1/7, you might not know that the answer is 12/35 unless you knew that 1/5 = 7/35 and 1/7 = 5/35

The common denominator here is 35. 3/5+5/7 is 21/35+25/35. This is 46/35 or 1 and 11/35.

Sometimes fractions have different denominators. These are called unlike fractions. When adding or subtracting fractions with unlike denominators, it is necessary to find a common denominator to get the correct answer. This is the same process as finding the least common multiple. Example 1/30 + 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 lowest common denominator.

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common denominator:60 :)

35 is.

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Assuming you mean the whole number 5 and the whole number 7, then the common denominator would be 1, as 5/1=5 and 7/1=7. The GCF of 5 and 7 is 1. The LCM of 5 and 7 is 35. If you are talking about common denominators, the LCM is applicable.