Some instruments, like U. S. Treasury Bonds, trade in fractions. You can enter fractional box sizes 3 ways: 1. Enter a zero (0), a space, and the numerator of the fraction, i.e., 0 5, for 5/32nds. 2. Enter the decimal equivalent of the fraction. For more information on entering fractional values, please read the discussions available in Entering Fractional Box Sizes