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

Using Beaded Number Rods to help kids visualize addition/subtraction. ~Free number toppers, flashcards and tips/ideas~ From: Common Core connections USA, please visit

T's First Grade Class: Ziploc Slider Bag Number Lines. Draw a number line with sharpie on a ziploc slider bag and use the slider as the tool to add or subtract two numbers.

Counting/Adding Game: "Race you to could easily be adapted to a lower number for younger children or made more difficult by adding a subtraction element. I can totally make this for my classroom!