Fact Mastery: Addition & Subtraction by Key Education
Help students master fundamental facts now to prepare them for advanced math later! Basic addition and subtraction facts can be easily recalled by using strategies that build understanding of numbers. Includes over 75 half-page drills on sums and minuends up to 20, 15 mega-fun games, and 40 timed tests. Supports NCTM standards. by Key Education

Grade Level: 1, 2, 3