What is the Least Common Denominator of 3 and 7?




You need to know the least common denominator (LCD) of 3 and 7 if you want to add or subtract two fractions with 3 and 7 as denominators.

The least common denominator, also called lowest common denominator (LCD), of 3 and 7 is 21.


Here is a math problem example where you need to know the LCD of 3 and 7 to solve:

3/3 + 2/7 = ?

Step 1) Take the LCD and divide each denominator by it as follows:

21/3 = 7
21/7 = 3

Step 2) Multiply each nominator with the respective answers from Step 1:

3 x 7 = 21
2 x 3 = 6

Step 3) Put it all together to solve the problem:

21/21 + 6/21 = 27/21
= 3/3 + 2/7 = 27/21

It's that easy! Once again, the lowest common denominator (LCD) of 3 and 7 is as follows:

21


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