You need to know the least common denominator (LCD) of 4 and 87 if you want to add or subtract two fractions with 4 and 87 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 4 and 87 is 348.
Here is a math problem example where you need to know the LCD of 4 and 87 to solve:
3/4 + 2/87 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
348/4 = 87
348/87 = 4
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 87 = 261
2 x 4 = 8
Step 3) Put it all together to solve the problem:
261/348 + 8/348 = 269/348
= 3/4 + 2/87 = 269/348
It's that easy! Once again, the lowest common denominator (LCD) of 4 and 87 is as follows:
348
Find Least Common Denominators
Enter another two numbers below to find the Least Common Denominator.