9 rolls of quarters
40 quarters in a roll
Sample Student Solutions/Approaches
9×40 quarters=9×(10×4) quarters=
1) Which approach is more likely to be used by a 4th grader? 5th? 6th?
2) Which method is more commonly demonstrated in the text or by the teacher?
3) How do you get Student 1 to include UNITS/LABELS like
9 rolls × 40 quarters/roll × $0.25 etc???
4) How many children in Grades 3-6 intuitively use 2nd approach and can solve it mentally?
Of course no one out there is thinking:
"Well those are the 'smart' kids. We don't even have to teach them a method. Besides, their way of thinking is just not accessible to the rest of the group and would only confuse them. So I wouldn't even bring it up..."