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Pre-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)Humble Math – Double Digit Addition & Subtraction : 100 Days of Practice Problems: Grades 1-3, Word Problems, Reproducible Math Drills