Easy as 1, 2, 3 (in base 5 + 5)

12 = 3 x 4
56 = 7 x 8
90 = 360/4

      0 + 12 = 3 x 4
      5 + 67 = 8 x 9 = 360/5

4 x 5 x (6 + 6 + 6) = 360 = (5 + 5) x 6 x 6

                    1 + 2 + 3 + 4 = 5 + 5
1 + 2 + 3 + ... + 8 = 9 x 4 = 6 x 6

    1 + 2 + 3 + ... + (5 + 5) = 55
    1 + 2 + 3 + ... + 6 x 6 = 666
 

Paradox of Expectation

When you expect a lot of some promising event, thing or person, there tends to be more disappointing than had you not, and so in order to maximise your pleasure you need to avoid expecting so much. To put it another way, if you expect to be disappointed, then you won't be disappointed!