You need to know the least common denominator (LCD) of 3 and 39 if you want to add or subtract two fractions with 3 and 39 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 3 and 39 is 39.
Here is a math problem example where you need to know the LCD of 3 and 39 to solve:
3/3 + 2/39 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
39/3 = 13
39/39 = 1
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 13 = 39
2 x 1 = 2
Step 3) Put it all together to solve the problem:
39/39 + 2/39 = 41/39
= 3/3 + 2/39 = 41/39
It's that easy! Once again, the lowest common denominator (LCD) of 3 and 39 is as follows:
39
Find Least Common Denominators
Enter another two numbers below to find the Least Common Denominator.