Math Mammoth Grade 4-A Worktext is the student book for the first half of grade 4, and part of the Math Mammoth Grade 4 complete curriculum. This book covers addition, subtraction, patterns, graphs, large numbers, multi-digit multiplication, time, and measurement. The 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 meets and exceeds the Common Core standards. Please note this is a student worktext and does not contain the answers. The answer key book is available separately.