You need to know the least common denominator (LCD) of 90 and 6 if you want to add or subtract two fractions with 90 and 6 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 90 and 6 is 90.
Here is a math problem example where you need to know the LCD of 90 and 6 to solve:
3/90 + 2/6 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
90/90 = 1
90/6 = 15
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 1 = 3
2 x 15 = 30
Step 3) Put it all together to solve the problem:
3/90 + 30/90 = 33/90
= 3/90 + 2/6 = 33/90
It's that easy! Once again, the lowest common denominator (LCD) of 90 and 6 is as follows:
90
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