Write-On/Wipe-Off books are engaging, versatile learning tools that can be enjoyed over and over again. Each book is geared toward helping children develop and master basic skills. Durable pages allow for easy erasing, offering endless opportunities for practice and learning fluency. Use a dry-erase marker to fill in the answers and then wipe away and start again. The colorful pages and captivating activities make learning fun! Using this book, children will: Practice addition and subtraction facts up to 20. Practice using a number line. Solve double-digit addition and subtraction problems. Solve word problems.