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Spectrum 1st Grade Math Workbooks, Ages 6 to 7, Grade 1 Math Workbook, Adding and Subtracting Through 100, Place Value, Fact Families, 2-D and 3-D Shapes – 160 Pages (Volume 42)School Zone – Subtraction 0-12 Flash Cards – Ages 6 and Up, 1st Grade, 2nd Grade, Numbers 0-12, Math, Problem Solving, Subtraction Problems, Counting, and More