Q: What are the common denominators for 4 and 7?

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3 1 7 4 + 8 is 8. Remember to change the denominators into common denominators. (3/4 would turn into 6/8)

you subtract the top 2 numbers and then leave the denominators the same like: 7/8-4/8=3/8. Get it?

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The denominator of 3/4 is 4 The denominator of 7/10 is 10 4 and 10 are not the same number so the two fractions are said to have unlike denominators.

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3 1 7 4 + 8 is 8. Remember to change the denominators into common denominators. (3/4 would turn into 6/8)

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you subtract the top 2 numbers and then leave the denominators the same like: 7/8-4/8=3/8. Get it?

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.

Find the LCM of the denominators. Since the LCM of 3 and 4 is 12, the least common denominator of 1/3 and 1/4 is 12.

There are infinitely many common denominators. The smallest of these is 42.

7/8 and 1/8 have common denominators

If the fractions have the same denominators, just add the numerators: 2/7 + 3/7 = 5/7 If the fractions have different denominators, it is necessary to make them the same by finding the least common denominator, and converting the fractions. Example 1/3 + 1/4 The LCD for 3 and 4 is 12. 1/3 = 4/12 1/4 = 3/12 Now that the denominators are the same, we can add the numerators. 4/12 + 3/12 = 7/12 1/3 + 1/4 = 7/12

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