Multiplication Numbers & Operations in Base 10

More, More Numbers and Operations in Base 10



I’m inclined to say that this is a classic working memory mistake. You’ve got a resources-heavy calculation being done in the student’s head, and you’ve got this 3 floating around in the problem, and it ends up in the ones place.

Agree? Disagree? Thoughts?

2 replies on “More, More Numbers and Operations in Base 10”

For the old blind bats in the room (or bat, if I’m alone): it’s challenging to see these last few scans with the heavy shadows. Also, what grade are the students?

That said: I would want to watch the student or have her/him do some similar problems and see if this is a fairly frequent error, and if it is dependent upon certain number combinations or fairly random. Your speculation might be right, but based on this single example, it’s hard to say.

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