Getallenlijn verder met 10 How to make a Montessori "teen" board (Adding n = teen number) >>Take it further by adding 10 to other double digit numbers. Could make multiple sets for centers out of index cards.
15 Hands-On Counting and Cardinality Number Centers (Black and White) 1-10
This set has six hands-on centers for teen numbers in kindergarten. Great activities for math stations! These are good ideas to get started with teen numbers. The links with the number bonds might be super helpful.
hair gel, food coloring, glitter - my kids LOVE these! Make sure you put tape or something over the zipper side of the bag! We had problems with leaking after they were played with for a while. :) Hair gel and food coloring