You need to know the least common denominator (LCD) of 8 and 90 if you want to add or subtract two fractions with 8 and 90 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 8 and 90 is 360.
Here is a math problem example where you need to know the LCD of 8 and 90 to solve:
3/8 + 2/90 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
360/8 = 45
360/90 = 4
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 45 = 135
2 x 4 = 8
Step 3) Put it all together to solve the problem:
135/360 + 8/360 = 143/360
= 3/8 + 2/90 = 143/360
It's that easy! Once again, the lowest common denominator (LCD) of 8 and 90 is as follows:
360
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