This is the best free site you'll find for keeping students engaged and learning math!
I feel that this is a wonderful teaching tool but I do wish that clearer instructions were given in the section using addition and subtraction with numbers up to four digits.
How I Use It
I have used this site to introduce, direct, guide and enhance my math instruction. I have a smart board in my classroom and I love to use this site with direct instruction as well as for independent practice and to extend learning.