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This is what is wrong with so many US math curricula.

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    You probably know that in international comparisons,
    US students don't do really well in math.

    One reason for that can be found in comparing the typical math
    curricula in those countries that do well, versus typical
    curricula used in the USA.

    The following article of mine is based on a report by William
    Schmidt, Richard Houang, and Leland Cogan called A Coherent
    Curriculum: The Case of Mathematics, which appeared in
    Summer 2002 in American Educator.

    Some differences that emerge are as follows. The US math
    curricula tend to be

    * not focused. No country in the world covers as many topics
    as US in their mathematics textbooks. For example, in
    Japan, eighth-grade textbooks have about 10 topics
    whereas US books have over 30 topics.

    * highly repetitive. The average duration of a topic in US is
    almost 6 years (!) versus about 3 years in the best-
    performing countries. Lots of spiraling and reviewing
    is done. Like Schmidt says, "We introduce topics early and
    then repeat them year after year. To make matters worse,
    very little depth is added each time the topic is addressed
    because each year we devote much of the time to reviewing
    the topic."

    * not very demanding by international standards, especially
    in the middle-school. In the USA, students keep studying
    basic arithmetic till 7th and 8th grade, whereas other
    countries change to beginning concepts in algebra and
    geometry.

    * incoherent. The math books are like a collection of
    arbitrary topics. Like Schmidt et al. say, "...in the United

    States, mathematics standards are long laundry lists of
    seemingly unrelated, separate topics."

    What this means is that typically in the US, a math topic is
    studied for a short time, and then the next one, and then the
    next one, on and on. A good part of this short time is spent
    reviewing previous year's knowledge. It follows that any
    particular math topic is NEVER studied very deeply in any
    given school year.

    Also, during the school year, many topics are covered but not in
    a coherent and logical order. Instead the topics tend to jump
    here and there in somewhat of an arbitrary fashion.

    So, the end result of following a curriculum that is like
    hodgepodge and "inch deep and mile wide", by the end of eighth
    grade US students are about two years behind their
    counterparts in the best performing countries.


    *******************************************
    CHART WHICH I CAN'T SHOW IN THE EMAIL
    *******************************************

    I need you to click to my website to see these very revealing two
    charts
    that show which topics are typically covered on which
    grade, either in the States, or in the best performing countries.

    I got a special permission from the main author of the
    aforementioned report to reproduce these on my site.

    You can continue reading the article there.

    http://www.homeschoolmath.net/teaching/coherent-curriculum.php#chart

    Sincerely,
    Maria Miller

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