Math Basics Grade 2 Author:Barbara Bando Irvin, Ph.D. Written and reviewed by a mathematics specialist, this workbook teaches and reinforces the math skills second graders need most. Skills include adding and subtracting to 18, adding and subtracting two- and three- digit numbers, regrouping, renaming, beginning multiplication, and more. PRINCIPLES AND STANDARDS FOR SCHOOL MATHEMATICS, published by... more » the NATIONAL COUNCIL OF TEACHERS OF MATHEMATICS(NCTM), was used as a guide in writing this book.« less