You need to know the least common denominator (LCD) of 7 and 75 if you want to add or subtract two fractions with 7 and 75 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 7 and 75 is 525.
Here is a math problem example where you need to know the LCD of 7 and 75 to solve:
3/7 + 2/75 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
525/7 = 75
525/75 = 7
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 75 = 225
2 x 7 = 14
Step 3) Put it all together to solve the problem:
225/525 + 14/525 = 239/525
= 3/7 + 2/75 = 239/525
It's that easy! Once again, the lowest common denominator (LCD) of 7 and 75 is as follows:
525
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