You need to know the least common denominator (LCD) of 78 and 4 if you want to add or subtract two fractions with 78 and 4 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 78 and 4 is 156.
Here is a math problem example where you need to know the LCD of 78 and 4 to solve:
3/78 + 2/4 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
156/78 = 2
156/4 = 39
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 2 = 6
2 x 39 = 78
Step 3) Put it all together to solve the problem:
6/156 + 78/156 = 84/156
= 3/78 + 2/4 = 84/156
It's that easy! Once again, the lowest common denominator (LCD) of 78 and 4 is as follows:
156
Find Least Common Denominators
Enter another two numbers below to find the Least Common Denominator.