For the simple reason that 48 is not a multiple of 18 (18 does not go into 18).
18 goes into 48 2.6666666666666666666666666666667 times.
It does not go in evenly
18 goes into 864 48 times. That can also be rephrased as 864 divided by 18=48
48 will not go into 12 however 12 will go into 48 four times 12x4=48 yet using decimals it should go into 12 0.25 times
18 times.
So the least common multiple means what they both multiply to get the same value. Unfortunately 48 doesn't go into 18, so we multiply that by 2. 96 still doesn't go into 18, so we multiple "48" by 3, 144 does go into 18. So 144 is your least common multiple.
18 goes into 100 how many times. Find this and divide by 48. or 1/18=48/100 18 times 48 divide by 100.
2 with remainder 12.
21.375 times exactly.
18 is 37.5% of 48
The LCM of 18 and 48 is 144.