Using only sums and differences, and not necessarily all four numbers, 1, 3, 9 and 27 will make all numbers from 0 to 40.
8
3 and 9
(60 - 2*27) + 9/3 = 9
They can be: 27 times 5 = 135
Assuming the order of the numbers is not important, then ((4 x 2) + 1) x 3 = 27.
Using 1, 2, and 3, you can make 27 whole numbers.
Using only sums and differences, and not necessarily all four numbers, 1, 3, 9 and 27 will make all numbers from 0 to 40.
8
27 + 27
The whole numbers that multiply to make 27 are: 1x27, and 3x9.
117
9 x 3 = 27
There are 27 of them.
(6*4)+2+1 = 27
20 4 and 3
3 and 9