Many children never master fractions. When asked whether 12/13 + 7/8 was closest to 1, 2, 19, or 21, only 24% of a nationally representative sample of more than 20,000 US 8th graders answered ...

Start by downloading the zipfile for the lab. It contains code for the Fraction class, a makefile, a set of driver programs and a test script. Note that the green boxes in this lab and in others are ...