You need to know the least common denominator (LCD) of 40 and 5 if you want to add or subtract two fractions with 40 and 5 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 40 and 5 is 40.
Here is a math problem example where you need to know the LCD of 40 and 5 to solve:
3/40 + 2/5 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
40/40 = 1
40/5 = 8
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 1 = 3
2 x 8 = 16
Step 3) Put it all together to solve the problem:
3/40 + 16/40 = 19/40
= 3/40 + 2/5 = 19/40
It's that easy! Once again, the lowest common denominator (LCD) of 40 and 5 is as follows:
40
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