You and a friend are perfectly balanced on a teeter-tooter. You may want to use bingo chips as counters instead of using paper models. I also use golf tees instead of cups. Both manipulatives are inexpensive, more durable, easy to store, and take less set-up time. When adding and subtracting integers or decimals, we include an activity that deals with making a budget or running a company.
Students practice their mathematical skills and experience the idea of what accounting is all about.
Each pair of players takes turns calling out coordinates to sink the ships. We mail them out to other schools and then use spreadsheet software to analyze the results and make graphs. Students answer questions regarding their height, number of pets, siblings, shoe size, wingspan, and so on. Working in pairs, one students creates a triangle while the other classifies it and justifies their answer. Then they switch roles.