archive2009-14.pdxradio.com » Politics and other things

How the teaching of Math has changed over the decades!

(33 posts)
  • Started 8 years ago by Deane Johnson
  • Latest reply from Andy_brown

  1. Alfredo_T
    Member

    But carpentry, sheetrocking, furniture making, etc. use the traditional fractional inches.

    Posted on September 2, 2011 - 03:02 PM #
  2. jr_tech
    Member

    But the times they are a changing!

    http://www.amazon.com/Bosch-DLR130K-Digital-Distance-Measurer/dp/B001U89QBU/ref=sr_1_1?ie=UTF8&qid=1315001896&sr=8-1

    Fractions without thought :)

    Posted on September 2, 2011 - 03:19 PM #
  3. Andy_brown
    Member

    Engineers migrated to mks (meters-kilograms-seconds), the forerunner of SI, back in the 70's.

    http://en.wikipedia.org/wiki/MKS_system_of_units

    http://en.wikipedia.org/wiki/International_System_of_Units

    Engineers will convert their metrics when needed to English and generally use feet and decimal inches.
    Architects still work mostly in English and use feet and fractional inches.

    What is important is to know how to quickly go back and forth without the calculator.
    So regardless of whether you are talking meters or feet it helps to know that, e.g.,
    one eighth = .125 and 3/16 = .1875 (or 1/16 = .0625) .
    It is a time saver but not necessarily required. When you use it a lot, you remember it.
    Converting can be done in your head depending on the need for accuracy. The same
    goes for speed or distance. You know, like a 5k run is 3 miles or there are 3281 feet in a kilometer
    usually remembered as 328 feet to a 100 meters.

    Posted on September 2, 2011 - 03:29 PM #