You need to know the least common denominator (LCD) of 5 and 30 if you want to add or subtract two fractions with 5 and 30 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 5 and 30 is 30.
Here is a math problem example where you need to know the LCD of 5 and 30 to solve:
3/5 + 2/30 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
30/5 = 6
30/30 = 1
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 6 = 18
2 x 1 = 2
Step 3) Put it all together to solve the problem:
18/30 + 2/30 = 20/30
= 3/5 + 2/30 = 20/30
It's that easy! Once again, the lowest common denominator (LCD) of 5 and 30 is as follows:
30
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