You need to know the least common denominator (LCD) of 7 and 38 if you want to add or subtract two fractions with 7 and 38 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 7 and 38 is 266.
Here is a math problem example where you need to know the LCD of 7 and 38 to solve:
3/7 + 2/38 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
266/7 = 38
266/38 = 7
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 38 = 114
2 x 7 = 14
Step 3) Put it all together to solve the problem:
114/266 + 14/266 = 128/266
= 3/7 + 2/38 = 128/266
It's that easy! Once again, the lowest common denominator (LCD) of 7 and 38 is as follows:
266
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