Group competition to help students practice their basic facts. The cost is $1 per month per student. Students solve basic math facts + - x / on a timer. The faster they solve the problem the more bases they get. The timer starts at homerun and goes down to single as time passes. If time runs out or the student answers incorrectly the student would be out.
This site has searchable video cases of real elementary math lessons teaching standards based mathematics lessons. You can also see a complete lesson plan with handouts.