Subtraction 0 to 20

This book is a good resource for teaching concepts in math. It helps students to develop a working knowledge of subtraction mechanics, subtraction facts to 20, story problems, and other subtraction strategies; reinforce and review the rules that apply to subtraction; and assess understanding and application of these basic math skills. Bonus activities that integrate critical thinking are included for each basic skill. An answer key and student progress report are provided in the back of the book.

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