I have some students in my class who don't quite have "number sense". These are the kids who still don't automatically "count on" when adding two numbers together. When determining the sum of two dice, they still count the dots! These kids need more "hands on" opportunity to get to know these numbers inside out!
I absolutely LOVE Cuisenaire Rods for helping children develop their number sense. I posted about them a while ago with THIS POST about using Cuisenaire Rods to practice math facts and fact families. I've got some kids who need to back up even further and really need to get to know the individual numbers by using these manipulatives.
Come on over to Elementary Matters to see my ideas on using Cuisenaire Rods to develop Number Sense and download this freebie!