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Math Mammoth Add & Subtract 2-B is a book about adding and subtracting mentally and in columns within 0-100. The emphasis is on learning how to carry when adding in columns, and how to borrow when subtracting in columns. These concepts are explained in visual detail, including lots of picture exercises. This book is a continuation to the book Math Mammoth Add & subtract 2-A. Full answers are included.
Sample Pages (PDF):