The IXL Ultimate 3rd Grade Math Workbook, Activity Book for Kids Ages 8-9 Covering Addition, Subtraction, Multiplication, Division, Fractions, Geometry, and More Mathematics (IXL Ultimate Workbooks)

The IXL Ultimate 2nd Grade Math Workbook, Activity Book for Kids Ages 7-8 Covering Addition, Subtraction, Place Value, Geometry, Measuring, and More Mathematics (IXL Ultimate Workbooks)

The IXL Ultimate 4th Grade Math Workbook, Activity Book for Kids Ages 9-10 Covering Addition, Subtraction, Multiplication, Division, Fractions, ... and More Mathematics (IXL Ultimate Workbooks)

The IXL Ultimate 5th Grade Math Workbook, Activity Book for Kids Ages 10-11 Covering Multiplication, Division, Fractions, Decimals, Geometry, and More Mathematics (IXL Ultimate Workbooks)

Logic Workbook for Gritty Kids: Spatial reasoning, math puzzles, word games, logic problems, activities, two-player games. (The Gritty Little Lamb ... & STEM skills in kids ages 6, 7, 8, 9, 10.)

Sudoku Book for Adults and Seniors with 3 Levels of Difficulty: 402 Puzzles & Solutions, Easy to Hard (The Perfect Gift for Puzzle Lovers) (Gifts for Men & Women)

Preschool Math Workbook: Number Tracing, Addition and Subtraction math workbook for toddlers ages 2-4 and pre k

My First Logic Workbook for Gritty Kids: Spatial Reasoning, Math Puzzles, Logic Problems, Focus Activities. (Develop Problem Solving, Critical Thinking, Analytical & STEM Skills in Kids Ages 4, 5, 6.)

Gödel, Escher, Bach: An Eternal Golden Braid

Essential Calculus Skills Practice Workbook with Full Solutions