Any teachers out there?

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I love muliplication.com from a parents point of view for many reasons. Games move at a pace to engage memory, recall and repetition and it's fun! I was so intimidated by math when I was younger. This would have been such a great way for me to practice and build some confidence outside the classroom. I'm wondering if there are any games that teachers especially enjoy using or have had success with? Please post a comment, I would love to hear your feed back.