Twenty (20) !
5
3 x 40
25 times 2 equals 50
2 times 216 equals 432
2 times 19 equals 38
4
How about 21 times 25 = 525 as an example
750/3 = 250
9 * 3, 27 * 1, and more such as 13.5 * 2 if you want to go into numbers that are not whole numbers.
8 x 0 =4n 0 = 4n 0=n
40 is the answer
80