You need to know the least common denominator (LCD) of 61 and 78 if you want to add or subtract two fractions with 61 and 78 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 61 and 78 is 4758.
Here is a math problem example where you need to know the LCD of 61 and 78 to solve:
3/61 + 2/78 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
4758/61 = 78
4758/78 = 61
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 78 = 234
2 x 61 = 122
Step 3) Put it all together to solve the problem:
234/4758 + 122/4758 = 356/4758
= 3/61 + 2/78 = 356/4758
It's that easy! Once again, the lowest common denominator (LCD) of 61 and 78 is as follows:
4758
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