I could write down the answer, but it will be much more fun for you to do it yourself. Write down the prime factors of each number:
2 = 2
3 = 3
4 = 22
etc.
Then, for each individual Prime number, take the highest power (in this case, the only prime number with a power higher than 1 is 23), and multiply everything together.
8
Firstly, the number must be even. 2520 is perfectly divisible.
120
only 1 is the smallest number so uh yea...
9
The smallest number divisible by first four prime numbers is 2x3x5x7 = 210.
The smallest number which is exactly divisible by the numbers 8 9 and 10 is 360.
Every number is divisible by 1. Including negative numbers, that's an infinite list. There is no smallest.
The smallest number that is divisible by all the numbers 2 through 12 is 27,720.
4 is the smallest composite number and it is not divisible by the two given numbers.
12
510510