Math Mammoth Grade 3-B worktext (Light Blue Series) is the student book for the second half of third grade math. In this part B, the main areas of study are: * place value (4-digit numbers) * the concept of division and basic division facts; * geometry (area and perimeter); * measurement; * and fractions. A companion to this book, Math Mammoth Grade 3-A worktext, covers the first half of 3rd grade math (available separately at Lulu). Also available are the answer keys and a book containing cumulative reviews and chapter tests.