Math-Drills.com was launched in 2005 with around 400 math worksheets. Since then, tens of thousands more math worksheets have been added. The website and content continues to be improved based on feedback and suggestions from our users and our own knowledge of effective math practices. A gift to the children and math students of the world from the U.S. Department of Energy's Argonne National Laboratory.. You may copy this code, use it and distribute it free of charge, provided you do not alter it or charge a fee for copying it, using it, or distributing it. 2-Digit Addition (With Regrouping) Students will be regrouping (aka borrowing or renaming) numbers on these addition worksheets. 3-Digit Addition. This page has many worksheets and games for teaching students to add three-digit numbers. Addition worksheets are divided into many subtopics that would help both teachers and homeschool moms to choose more specifically. Each subtopic includes a lot of worksheets that would give a perfect practice in addition. We feature well over 12,000 printable sheets. This includes all major subject areas, templates, teacher timesavers, and forms. For a complete teacher curriculum resource please check out our math subject center. Addition - One, two, and three digit practice sheets. Algebra - Equations involving addition, division, multiplication, and subtraction.