I am so thrilled with Wolf(almost 5) today! He had been having some problems with ones and tens columns and carrying (not in his head, just on paper) and so we practiced with pennies and dimes (if there are more than ten pennies after they are added you change ten in for one dime). He picked it up really quickly and then added 1,234,567,890 + 1,234,567,890 all by himself. He was so pleased with himself. AND he seems to have figured out where to put the commas now! A good day.