Four: 1, 2, 3, 6.
18
There are 18.
1 3/18 to find that out: how many times does 18 go in 21 -once then you have 3 left over so it would be one whole and three parts of eighteen one and three eighteens
7 two-digit numbers.
18 of them.
18
1,2,3,6,9 & 18 !
no
200000000
Both.
Exactly 18 whole times with nothing left over.
If you meant what whole numbers can you use to multiply to 18, there's 9x2, 6x3, and of course 1x18 but you could multiply any number[s] to 18