How do you make the numbers 11-20 with four 4's and prentiss's?

Answer 1

There is more than one way to do it for most numbers, but here is one for each:

11 = 4/.4 + 4/4

12 = 4 x (4 - 4/4)

13 = 4! - 44/4

14 = (4 x 4) - (4 / sqrt(4))

15 = (4 x 4) - 4/4

16 = (4 x 4 x 4) / 4

17 = (4 x 4) + 4/4

18 = (4 x 4) + (4 / sqrt(4))

19 = 4! - 4 - 4/4

20 = 4 * (4 + 4/4)