You need to know the least common denominator (LCD) of 15 and 8 if you want to add or subtract two fractions with 15 and 8 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 15 and 8 is 120.
Here is a math problem example where you need to know the LCD of 15 and 8 to solve:
3/15 + 2/8 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
120/15 = 8
120/8 = 15
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 8 = 24
2 x 15 = 30
Step 3) Put it all together to solve the problem:
24/120 + 30/120 = 54/120
= 3/15 + 2/8 = 54/120
It's that easy! Once again, the lowest common denominator (LCD) of 15 and 8 is as follows:
120
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