You need to know the least common denominator (LCD) of 84 and 5 if you want to add or subtract two fractions with 84 and 5 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 84 and 5 is 420.
Here is a math problem example where you need to know the LCD of 84 and 5 to solve:
3/84 + 2/5 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
420/84 = 5
420/5 = 84
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 5 = 15
2 x 84 = 168
Step 3) Put it all together to solve the problem:
15/420 + 168/420 = 183/420
= 3/84 + 2/5 = 183/420
It's that easy! Once again, the lowest common denominator (LCD) of 84 and 5 is as follows:
420
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