Math Mammoth Grade 1-A Worktext (International Version) is the student worktext for the first half of grade 1 mathematics studies. In this part A, the main areas of study are: * The concepts of addition and subtraction; * strategies for addition and subtraction facts; and * developing understanding of whole number relationships and place value till The worktext is in full color, and contains both the necessary instruction and the problems & exercises (the 'text' and the 'work'), and is for the most part self-teaching. It does not contain the answers. The other parts of the Math Mammoth curriculum are: grade 1-B student worktext, grade 1 answer keys, and grade 1 tests and mixed revisions (all available on Lulu).