Q: What is the largest common denominator of 20 and 15?

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The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.

60

300

LCD(8, 20, 15) = 120

A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.

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The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.

The least common denominator (LCD) is 1.

20, although if you reduced 15/20 to 3/4, the common denominator would be 4.

60

60

300

LCD(8, 20, 15) = 120

180

60

The lowest common denominator of any set of whole numbers is 1

1/5 + 3/4 First you have to find the common Denominator. The common denominator is 20. 1/5 = 4/20 (5x4=20, so you have to multiply the 1 by 4 as well) 3/4=15/20 (4x5=20 and 3x5=15) Now that you know your common denominator is 20, you can now add your fractions. 4/20 + 15/20 = 19/20 (you only add the numerator, the denominator stays the same) so, your answer is...... 19/20

A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.