40 is the Least Common Denominator of 3/10 and 7/8, since it is the Least Common Multiple of 8 and 10. LCDs are usually used to add two fractions, and if that is what you are trying to do, 3/10 + 7/8 = 12/40 + 35/40 = 47 / 40 = 1 7/40.
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The LCD of 7/10 and 18/25 is 50.
LCD(7, 5, 10) = 10
56
If that's 3/8 and 7/10, the LCD is 40.If not, it's 13490
The LCD for 4/7 and 3/5 is 35.
The LCD for 3/4 and 4/7 is 28.
60
I think what you might have meant was LCD (Lowest Common Denominator) The LCD for 11/7 and 3/8 is 56 Making equivalent fractions using the LCD: 11/7 becomes 88/56 3/8 becomes 21/56