Book excerpt: Each week of problems for first grade centers on a different animal. Accurate facts about the animal are presented to make the problems more realistic. Mathematic skills practiced include: - addition and subtraction facts - column addition - 2- and 3-digit addition and subtraction - counting by 2s, 5s, and 10s - reading and interpreting graphs and charts - reading and writing numbers and number words - fractions - time - money - measurement