Comments+Week+of+April+18

Here are the notes and the developmental story...fix, update!

Lots of thought about development of place value. Are you aware that cardinality is a kindergarten standard in CC simply referring to knowing that everything counted is included in the last number spoken? So cardinality if they counted 54 would not break the number apart by place value. You may have in mind making composite units. I'm going to make a single unit of 10. Two of these composite units contain 20.

Alice