TeachMe: 2nd Grade is the fourth installment in the popular TeachMe series of educational apps for the iPhone, iPod touch, and iPad. TeachMe: 2nd Grade teaches six age-appropriate subjects to second grade children: spelling, sight words, long addition, long subtraction, fast addition and fast subtraction. TeachMe: 2nd Grade's unique TeachTech character recognition engine interprets a child's written answers, helping to reinforce writing skills while teaching math and spelling.