What number is one quarter of one tenth of one fifth of 200? 1 C = 1. One fifth (1 / 5) of 200 = 0.2 x 200 = 40. One tenth (1 / 10) of 40 = 0.1 x 40 = 4. One quarter (1 / 4) of 4 = 0.25 x 4 = 1.