Here are some free printable math worksheets for grade 3 algebra:
Introduction to Algebra
* Simple Equations: 10 problems (PDF)
* Introduction to Variables: 10 problems (PDF)
Equations with One Unknown
* Basic Addition and Subtraction Equations: 10 problems (PDF)
* Basic Multiplication and Division Equations: 10 problems (PDF)
* Solving Equations with Addition and Subtraction: 10 problems (PDF)
* Solving Equations with Multiplication and Division: 10 problems (PDF)
Graphing
* Basic Graphing: 10 problems (PDF)
* Reading Graphs: 10 problems (PDF)
Word Problems
* Simple Word Problems Involving Algebra: 10 problems (PDF)
* More Complex Word Problems Involving Algebra: 10 problems (PDF)
Mixed Review
* Mixed Review of Algebra Concepts: 20 problems (PDF)
Troubleshooting
* Troubleshooting Algebra Problems: 10 problems (PDF)
Remember to print the worksheets in grayscale or color as needed, and to adjust the font size and style to suit the needs of your students.