Math Mammoth Grade 2-A Worktext is the student worktext for the first half of grade 2, and part of the Math Mammoth Grade 2 complete curriculum. The 2-A worktext covers mental math, even and odd numbers, telling time, addition and subtraction facts within 0-18, adding two-digit numbers, geometry and fractions. The worktext contains both the necessary instruction and the problems and exercises (the 'text' and the 'work'; thus a "worktext"), and is for the most part self-teaching. Please note this student worktext does not contain the answers. This is the international version with Canadian currency, which means the materials use only metric units, and the chapter on money (not in 2-A but in 2-B) uses Canadian coins and bills. However, keep in mind that the "Grade 2" refers to the U.S. grade 2, and may not correspond exactly to the "grade 2" in Canada.