My son is doing a math worksheet. He is practicing the concept of 'carrying' when doing sums. The sheet has 16 problems, each is summing two threedigit numbers. What struck me as interesting was that the creator of the problems made every problem have at least two carries and most have three.
What is the probability distribution for the number of carries in finding the sum of two randomly selected threedigit numbers?
Feel free to generalize.
(In reply to
re: solution  so about that math test by Charlie)
You get my point. The whole thing struck me as way too artificial.
Rather than have the carries carries be natural (just over half the additions), they were everywhere. I don't know whether this will help or hinder the kids. Probably neither.

Posted by Jer
on 20170113 16:36:42 