You need to know the least common denominator (LCD) of 8 and 15 if you want to add or subtract two fractions with 8 and 15 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 8 and 15 is 120.
Here is a math problem example where you need to know the LCD of 8 and 15 to solve:
3/8 + 2/15 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
120/8 = 15
120/15 = 8
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 15 = 45
2 x 8 = 16
Step 3) Put it all together to solve the problem:
45/120 + 16/120 = 61/120
= 3/8 + 2/15 = 61/120
It's that easy! Once again, the lowest common denominator (LCD) of 8 and 15 is as follows:
120
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