You need to know the least common denominator (LCD) of 40 and 57 if you want to add or subtract two fractions with 40 and 57 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 40 and 57 is 2280.
Here is a math problem example where you need to know the LCD of 40 and 57 to solve:
3/40 + 2/57 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
2280/40 = 57
2280/57 = 40
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 57 = 171
2 x 40 = 80
Step 3) Put it all together to solve the problem:
171/2280 + 80/2280 = 251/2280
= 3/40 + 2/57 = 251/2280
It's that easy! Once again, the lowest common denominator (LCD) of 40 and 57 is as follows:
2280
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