You need to know the least common denominator (LCD) of 17 and 23 if you want to add or subtract two fractions with 17 and 23 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 17 and 23 is 391.
Here is a math problem example where you need to know the LCD of 17 and 23 to solve:
3/17 + 2/23 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
391/17 = 23
391/23 = 17
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 23 = 69
2 x 17 = 34
Step 3) Put it all together to solve the problem:
69/391 + 34/391 = 103/391
= 3/17 + 2/23 = 103/391
It's that easy! Once again, the lowest common denominator (LCD) of 17 and 23 is as follows:
391
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