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The IXL Ultimate 1st Grade Math Workbook, Activity Book for Kids Ages 6-7 Covering Addition, Subtraction, Place Value, Geometry, Counting Money, ... and More Mathematics (IXL Ultimate Workbooks)

The Math Inspectors: Story One - The Case of the Claymore Diamond

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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)

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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)