the LCM is 8. the hcf is 2
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The LCD of the given three numbers is 8
56 is the lcd of 8 and 7. You can get this by multiplying 8x7. 8 and 7 have no common factors; that is why you multiply the two numbers to get the lcd.
If that's 84 and 35, the LCD is 420.If that's 8/4 and 3/5, the LCD is 20.
Assuming you mean the LCM (Least Common Denominator of 2 fractions is the LCM of the denominators, which for 7/1 and 16/1 is 1), the answer is 112.
The least common denominator is 24.