You need to know the least common denominator (LCD) of 42 and 68 if you want to add or subtract two fractions with 42 and 68 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 42 and 68 is 1428.
Here is a math problem example where you need to know the LCD of 42 and 68 to solve:
3/42 + 2/68 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
1428/42 = 34
1428/68 = 21
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 34 = 102
2 x 21 = 42
Step 3) Put it all together to solve the problem:
102/1428 + 42/1428 = 144/1428
= 3/42 + 2/68 = 144/1428
It's that easy! Once again, the lowest common denominator (LCD) of 42 and 68 is as follows:
1428
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