What is the LCD of 3 over 10 and 7 over 8?

Answer 1

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.

Answer 2

15. Because it is the smallest number that both 3 (from 1/3) and 5 (from 3/5) divide into.

Answer 3

The LCD would be 56. The first fraction would read: 88/56 and the second fraction would read: 21/56

Answer 4

21.