Math Mammoth Grade 1-B Worktext is the student worktext for the second half of grade 1, and part of the Math Mammoth Grade 1 complete curriculum. This is the international version with Canadian currency, which means the materials use only metric units, and the chapter on money uses Canadian coins and bills. However, keep in mind that the "Grade 1" refers to the U.S. grade 1, and may not correspond exactly to the "grade 1" in Canada. The 1-B worktext covers addition and subtraction facts within 0-10, clock and calendar, shapes and measuring, adding and subtracting within 0-100, and counting coins. 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.