Numbers, Problems...Daily Food
I may have mentioned this before, but it needs mentioning again. The Mathematical Association of America (MAA) is offering an increasing number of FREE "products" for mathematics teachers and students.
First, NumberADay is exactly that. Each day, a new number is posted along with its special properties. Plus, you can do a search for your "favorite" number. If you cannot find it, you can even e-mail them a suggestion to include it. Finally, please watch what are considered the most popular numbers.
Second, MinuteMath offers a daily problem selected from a mathematics competition: the AMC-8, AMC-10, or AMC-12. Plus, the interactive version offers a hint and a solution plus more... As promised, the problems will definitely "exercise" you.
Great resources...keep it up, MAA!