As set out by the National Governors Association (NGA) and the Council of Chief State School Officers (CCSSO) in the Common Core State Standards Initiative. For more information, please visit the Number and Operations: Base Ten domain at the Common Core State Standards website.
September 18, 2013
Children like big numbers! Often before they can say all the numbers from one to one hundred reliably, children understand that one hundred is a lot. They quickly learn that one thousand is even more and one million even more than that.
Liping Ma describes some differences between American and Chinese math educators, specifically concerning the idea of regrouping. "It's always easier for children to subtract three from ten than from thirteen."
A child works to discover "how many more" a person has.
Joanne Mulligan provides an example of a six-year-old's personal rules for counting to 20.