You need to know the least common denominator (LCD) of 4 and 70 if you want to add or subtract two fractions with 4 and 70 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 4 and 70 is 140.
Here is a math problem example where you need to know the LCD of 4 and 70 to solve:
3/4 + 2/70 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
140/4 = 35
140/70 = 2
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 35 = 105
2 x 2 = 4
Step 3) Put it all together to solve the problem:
105/140 + 4/140 = 109/140
= 3/4 + 2/70 = 109/140
It's that easy! Once again, the lowest common denominator (LCD) of 4 and 70 is as follows:
140
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