number line arrows

Home › Forums › Questions about the standards › 6–8 The Number System › number line arrows

Viewing 2 posts - 1 through 2 (of 2 total)
  • Author
    Posts
  • August 2, 2012 at 4:20 am #758
    Alexei Kassymov
    Guest

    Any opinion on arrows on one or both sides of the number line. The former is prevelant in higher math, but makes sense in the context of basic physics, which seems to be getting more popular as an earlier subject.

    August 5, 2012 at 5:29 pm #818
    Bill McCallum
    Keymaster

    Golly, no, I don’t think I do have an opinion! But I will say that in Illustrative Mathematics we have adopted the convention that number lines have arrows at both ends (at least once you get beyond elementary school, where number lines are really number rays).

  • Author
    Posts
Viewing 2 posts - 1 through 2 (of 2 total)
  • You must be logged in to reply to this topic.