Math Mammoth Grade 1-A (Light Blue Series) student worktext teaches the concepts of addition, subtraction, and place value with two-digit numbers. It is meant for the first half of grade 1. This student worktext contains both the necessary instruction and the problems & exercises (the 'text' & and the 'work'; thus a "worktext"), and is fairly self-teaching. The curriculum is aligned to the Common Core standards. This is the full-color version; in other words, the inside are in full color. Please note this is a student worktext and does not contain answers.