You need to know the least common denominator (LCD) of 20 and 14 if you want to add or subtract two fractions with 20 and 14 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 20 and 14 is 140.
Here is a math problem example where you need to know the LCD of 20 and 14 to solve:
3/20 + 2/14 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
140/20 = 7
140/14 = 10
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 7 = 21
2 x 10 = 20
Step 3) Put it all together to solve the problem:
21/140 + 20/140 = 41/140
= 3/20 + 2/14 = 41/140
It's that easy! Once again, the lowest common denominator (LCD) of 20 and 14 is as follows:
140
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