FREE Addition Tic-Tac-Toe - This could be used as an opportunity for students to practice addition problem solving strategies learnd through CGI such as adding all the tens and then the ones, making tens, counting on, etc.

Numbers for skip counting and multiplication Here's a set of number organizers that show multiples of each number inside the number outline. These might be interesting pieces in student notebooks.

Unifix cubes are a concrete representation of addition/number bonds. Building the bond with the Unifix cubes is what develops number sense. Great use for flash cards instead of looking for just memorization