You need to know the least common denominator (LCD) of 61 and 31 if you want to add or subtract two fractions with 61 and 31 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 61 and 31 is 1891.
Here is a math problem example where you need to know the LCD of 61 and 31 to solve:
3/61 + 2/31 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
1891/61 = 31
1891/31 = 61
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 31 = 93
2 x 61 = 122
Step 3) Put it all together to solve the problem:
93/1891 + 122/1891 = 215/1891
= 3/61 + 2/31 = 215/1891
It's that easy! Once again, the lowest common denominator (LCD) of 61 and 31 is as follows:
1891
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