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Spectrum Kindergarten Math Workbooks, Ages 5 to 6, Counting Numbers, Addition and Subtraction, Geometry and Place Value, Kindergarten Math Workbook for KidsPre-Algebra Skills: (Grades 6-8) Middle School Math Workbook (Prealgebra: Exponents, Roots, Ratios, Proportions, Negative Numbers, Coordinate Planes, … & Statistics) – Ages 11-15 (With Answer Key)