You need to know the least common denominator (LCD) of 87 and 13 if you want to add or subtract two fractions with 87 and 13 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 87 and 13 is 1131.
Here is a math problem example where you need to know the LCD of 87 and 13 to solve:
3/87 + 2/13 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
1131/87 = 13
1131/13 = 87
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 13 = 39
2 x 87 = 174
Step 3) Put it all together to solve the problem:
39/1131 + 174/1131 = 213/1131
= 3/87 + 2/13 = 213/1131
It's that easy! Once again, the lowest common denominator (LCD) of 87 and 13 is as follows:
1131
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