At the beginning of the year I usually start with teaching my students place value. Place value is a concept that show up again and again throughout the year so it is essential that students have a solid understanding of it.
As part of my unit students become very familiar with the hundreds chart. At one of my math centers I have students put together a variety of hundreds chart puzzles.
You can get a copy of your very own for free here!!!! I recommend printing each set on a different color piece of card stock so they are easier to gather into sets if they get mixed up.