Third Grade Math Worksheets - Free Printable Math PDFs | edHelper.com Math Worksheet Practice Workbook. 3rd Grade Math and Critical Thinking Worksheets. Math Workbooks for Third Graders following Common Core Standards: Chapter 1: Numbers to 10,000. Place Value (challenge pages) Chapter 2: Mental Math and Estimation. Using Bar Models: Addition and Subtraction. Cumulative Review (Chapters 1-2) Chapter 3: Addition ...