By far the most popular and well-stocked category of used instruments is our selection of guitars, where we've got a huge variety of all the big names. Used Gibson Les Paul, pre-owned Fender Telecaster and secondhand Stratocaster guitars are commonly found within these pages, waiting for their new homes with players and collectors.
22/7 is a pretty decent choice for teaching 11-year-olds about fractions that are close to pi. 355/113 would be better, if you think they can remember numbers that big. And approxRational is fun. Exercise for the interested reader: implement an inverse to approxRational.
0 1. An improper fraction is a fraction where the numerator is greater than the denominator, such as 35/6 or 9/2. First, convert your mixed number to an improper fraction. 4 1/2 = (4/1)(2/2) + (1/2) = 8/2 + 1/2 = 9/2. So 9/2 is one improper fraction that equals 4 1/2.