Friends...I have another great idea to keep your kiddos thinking! Many moons ago I saw an article about a teacher that used a door bell in their classroom to get her student's attention. I took that idea and made it into a learning brake in my classroom. I first made a trip over to Lowes to grab a plug in doorbell. You can get one for around $15-$20.
It is totally worth it! I plugged it in behind a cabinet and then hid the remote under my desk. I created a pocket full of math questions and placed them at my door with a sign that reads...Answer ME! When we have a little break in time or I need to get their attention I press the remote under my desk and it MAGICALLY rings. The class is trained to go to their seat and raise their hand. I then call on one to read the question and we answer it together.
Just remember Friends...Sometimes it is the little things that make all the difference:)