You need to know the least common denominator (LCD) of 3 and 30 if you want to add or subtract two fractions with 3 and 30 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 3 and 30 is 30.
Here is a math problem example where you need to know the LCD of 3 and 30 to solve:
3/3 + 2/30 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
30/3 = 10
30/30 = 1
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 10 = 30
2 x 1 = 2
Step 3) Put it all together to solve the problem:
30/30 + 2/30 = 32/30
= 3/3 + 2/30 = 32/30
It's that easy! Once again, the lowest common denominator (LCD) of 3 and 30 is as follows:
30
Find Least Common Denominators
Enter another two numbers below to find the Least Common Denominator.