You need to know the least common denominator (LCD) of 70 and 23 if you want to add or subtract two fractions with 70 and 23 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 70 and 23 is 1610.
Here is a math problem example where you need to know the LCD of 70 and 23 to solve:
3/70 + 2/23 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
1610/70 = 23
1610/23 = 70
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 23 = 69
2 x 70 = 140
Step 3) Put it all together to solve the problem:
69/1610 + 140/1610 = 209/1610
= 3/70 + 2/23 = 209/1610
It's that easy! Once again, the lowest common denominator (LCD) of 70 and 23 is as follows:
1610
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