Twenty (20) !
2 times 216 equals 432
2 times 19 equals 38
5
4
How about 21 times 25 = 525 as an example
3 x 40
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.
50 times 2 = 100
8 x 0 =4n 0 = 4n 0=n
1760/2 = 880 yards