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2 votes
3 answers
1k views

What is the motivation for teaching Factoring by Grouping?

This seems like such a niche trick to teach students when factoring polynomials. Like, the polynomials I've seen textbooks ask students to factor by grouping seem so cherry picked that I can't imagine ...
Mike Pierce's user avatar
  • 4,855
8 votes
2 answers
334 views

Is multiplication by zero clear for and understood by K-3 students?

For K-3 students, perhaps it is not acceptable to introduce multiplication by zero as a property or definition. Instead, the child may think about multiplication as, e.g., repeated addition. Examples ...
Abdallah Abusharekh's user avatar
14 votes
5 answers
597 views

When is it a good idea to avoid talking about why something works?

I am teaching, among other things, a college algebra course this semester. In this course we do a lot of conceptual things but we also do some techniques to prepare students for calculus. One of the ...
Chris Cunningham's user avatar