Depending on what your code is doing, a change of units may also help. As an example if you were working with currency, rather than working in units of dollars:
x_dollar = 0.1;
y_dollar = x_dollar + x_dollar + x_dollar;
y_dollar - 0.3
maybe work in units of cents:
x_cents = 10;
y_cents = x_cents + x_cents + x_cents;
y_cents - 30
For distances, use centimeters or millimeters instead of fractions of a meter.
