You need to know the least common denominator (LCD) of 17 and 7 if you want to add or subtract two fractions with 17 and 7 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 17 and 7 is 119.
Here is a math problem example where you need to know the LCD of 17 and 7 to solve:
3/17 + 2/7 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
119/17 = 7
119/7 = 17
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 7 = 21
2 x 17 = 34
Step 3) Put it all together to solve the problem:
21/119 + 34/119 = 55/119
= 3/17 + 2/7 = 55/119
It's that easy! Once again, the lowest common denominator (LCD) of 17 and 7 is as follows:
119
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