Beginning of the Year, End of Year, First Day or First Week of School Math Magic of 25 Activity.Want to get your students excited about math and impress them? Check out these Math Magic Tricks that always work! Let them wonder, then reveal the secret, and let them become the magicians. The Unbelievable 25 Challenge.Every number you start with seems different: random, unpredictable, unique. But as you roll, calculate, and follow the sequence of operations, something strange begins to happen...