Decimal line zooming

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5 Responses

  1. Rogan says:

    Have you seen this iOS app?
    https://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8
    It is an intuitive and fun way to zoom in on the number line. My kids love it.

  2. Michaela says:

    This model is a great idea. I can imagine it would really help students to understand the idea of precision on the numberline and what it means to keep on extending digits after the decimal place.
    In terms of getting students to understand the size difference of 3.2 and 3.12, I took my students through a stage process of concrete, visual, abstract. For Concrete, they created the decimals with blocks and counters on a place value mat, comparing the number of blocks in each place value column. The next stage involved just writing 3.2 and 3.12 in a place value column and comparing the numbers in each column.
    Then after mastering these stages, they solved the problem in a more abstract sense, just looking at the 2 numbers themselves and determining size.

  3. Mark H says:

    Great idea. Check this out for an interactive version of the same thing.

    http://www.mathsisfun.com/numbers/number-line-zoom.html

  4. Emma says:

    Couldn’t agree more – so effective. You may have seen the primary national strategies interactive teaching program’s (ITPs) they have a fantastic one that does exactly this. I love them! (Number dials is my favourite!)

  1. 04/06/2013

    […] William Emeny addresses a common student mistake in Decimal line zooming. […]