Learn how to subtract across zeros and regroup numbers. There are interactive tutorials, powerpoint slides, math games, worksheets, and word problems. There are also links to eThemes Resource on subtraction and addition.
Learn how to subtract using the rule of regrouping. These sites have online lessons, PowerPoint presentations, and a rhyme that can help kids to understand how regrouping works. Includes printable worksheets and puzzles, online exercises and games. This page also includes a link to another eThemes resource on addition and subtraction.
These sites have interactive games, quizzes, and activities for addition and subtraction. There are also flashcards and sample questions you can print out. Includes links to eThemes Resources on place value, rounding, multiplication, and word problems.