Math Mammoth Addition 1 is a self-teaching workbook dealing with the addition concept and addition facts within 0-10. The first lessons in the book concentrate on adding within 0-5, introduce missing addend problems, comparing, and teach several important properties of addition. The second part of the workbook practices memorizing basic addition facts where the sum is less than or equal to ten. The book is most suitable for first grade, though is not tied to any grade level. Selected answers are appended..

Sample Pages (PDF):

Contents
Two Groups and a Total
Learn Symbols + and =
Missing Items
Sums With 6
Addition On Number Line
Sums With 9