Asking students to figure out Peter Liljedahl’s 4 Aces Card Trick is a great way to increase engagement. Exploring the magic in math is always a good idea! 
Access Peter’s 4 Aces Card Trick Here
Skyscrapers
This is a great challenge for kids of all ages! It’s similar to Sudoku in its reasoning skills. Check out Brainbashers for more puzzles (and for printable versions)
If you write out the numbers from 1 to 1000, how many times will you write the number 7?