I just wanted to let you know that I used Mokoto Yoshida's stuff in class and it worked beautifully. Plastic egg carton ten frames with unifix cubes, the magnetic counters critical thinking piece worked so well!The kids really got the concepts and enjoyed the process. He is a wonderful presenter: clear, simple, and smart. Gave me new uses for materials I already had.
His explanation of cardinality clarified a way of thinking for me that I suspected was true, but now feel free to pursue with greater conviction and skill. So thank you so much. Have a great Christmas Holiday and a Happy Healthy New Year!