Construction calculator: entering fractions

The reason most of my students love the construction calculator is that it will do fractions for you. Scientific calculators will do fractions, too - but what's unique about construction calculators is that when we do decimal to fraction conversions, all fractions will be displayed as "construction fractions" - halves, quarters, eighths, sixteenths, thirty-seconds, and sixty-fourths. This means they'll be measurable using our standard measuring tools.