You need to know the least common denominator (LCD) of 42 and 8 if you want to add or subtract two fractions with 42 and 8 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 42 and 8 is 168.
Here is a math problem example where you need to know the LCD of 42 and 8 to solve:
3/42 + 2/8 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
168/42 = 4
168/8 = 21
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 4 = 12
2 x 21 = 42
Step 3) Put it all together to solve the problem:
12/168 + 42/168 = 54/168
= 3/42 + 2/8 = 54/168
It's that easy! Once again, the lowest common denominator (LCD) of 42 and 8 is as follows:
168
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