10111.11two_{\text{two}}two
convert the number to base 10.
10111.11two_{\text{two}}two = 1 x 24^{4}4 + 0 x 23^{3}3 + 1 x 2^{2}2 + 1 x 21^{1}1 + 1 x 20^{0}0 + 1 x 2−1^{-1}−1 + 1 x 2−2^{-2}−2
= 16 + 0 + 4 + 2 + 1 + 12\;\frac{1}{2}21 + 14\;\frac{1}{4}41
= 23 + 34\;\frac{3}{4}43 = 23 34\;\frac{3}{4}43
