How well do you know your multiplication facts?
Are you comfortable with digits beyond 12?
Here's a chance to test yourself (and your students) with this fun, challenging game. It's a Speed Grid Challenge, and I'll admit that it defeated me quite a few times.
This is a good mental math activity (with introductory algebra skills) that challenges thinkers to solve by choosing numbers from a grid. Sounds kind of easy, doesn't it? Not if you're unable to quickly calculate a number times 13, 15, or higher!
You can select how many problems to solve in however many minutes you choose. The default, 8 questions in 2 minutes, is a good place to start. If you are able to do that comfortably, up the stakes to more problems and/or less time to solve. Conversely, if the default is too challenging (ahem), feel free to decrease the number of problems, or increase the time limit. Once students find a comfortable pace, encourage them to strive for a more challenging pace.
If you're looking for math activities for kids, especially ones who've mastered their multiplication facts, this free game is a good mental exercise. It would be a good math center or computer station activity.
Try it yourself, and with your math class. It's one of my favorites!