Math in the Low LandsPosted: August 26, 2016
The following is a guest post from Joost Hulshof, A Professor in the Department of Mathematics at VU University Amsterdam. You can read his bio here and he tweets under the handle @joost_hulshof. I have asked him to explain maths teaching reform in The Netherlands.
The Dutch word for mathematics is ‘wiskunde’. We owe the name to Simon Stevin. Wiskunde is what you get in Dutch secondary education. The supposedly highest level of Dutch secondary education is VWO, which loosely translates as PSE, Preparing for Scientific Education. Essentially VWO is the only form of secondary education (high school) that allows you to enter university in the Low Lands. VWO takes 6 years, after 6 years in primary education (following 2 years in Kindergarten). In primary education you don’t get wiskunde but ‘rekenen’, which I would translate as ‘arithmetic’, in accordance with the language switch in Wikipedia (here and here).
Many things have changed since I had arithmetic (rekenen) and mathematics (wiskunde) in school. A first omen of changes to come was when one of my high school teachers, having returned from Utrecht where Hans Freudenthal had delivered his farewell lecture, reported that Freudenthal had predicted that wiskunde as we knew it then was bound to disappear from high school. A worrying statement that I had happily forgotten when I enrolled for mathematics at Leiden University a year later.
Why did I choose mathematics after high school? Because I enjoyed it. What had really struck me in high school mathematics were complex numbers and the first steps in complex analysis from a book co-authored by Freudenthal. This was a special topic in Wiskunde II which was mainly linear algebra and 3D-geometry. There were only 8 pupils (all boys unfortunately) in that Wiskunde II class. Most of them later chose mathematics or physics at university.
The mainstream Wiskunde I was a combination of differential and integral calculus, probability, statistics, and some geometry, especially the study of functions and their graphical representations, I liked it a lot and the calculus required to sketch the graphs was also fun. I did not have a calculator in high school. You learned mathematical techniques and how to apply them. Nowadays we don’t have Wiskunde I and II, but Wiskunde A,B,C,D. It’s a long and complicated story to explain what those stand for.
I don’t remember a lot of applications to real life problems from the calculus part, but Wiskunde I gave you a solid basis for university study in any of the exact sciences, in the same way that rekenen (arithmetic) in elementary school had given you a solid basis for wiskunde (mathematics) in high school. This was thanks to a systematic treatment of calculating with numbers such as integers, fractions and decimal representations, and applications in which physical units were required.
Forty years have passed since I came to hear of Freudenthal’s prophecy. I now know that Freudenthal’s prophecies were plans, and that these plans were not restricted to wiskunde in high school, as rekenen in elementary school was in for a complete makeover as well. Since then rekenen and wiskunde have been redefined and merged into what I and others now call ‘Dutch Reform Math’, with devastating consequences that are systematically denied by the group of school of reformers who were founded and positioned at the center of educational power by Freudenthal. Why Freudenthal did so is for others to discuss. But he did.
Unlike Freudenthal himself, these reformers are mostly not mathematicians and therefore lack the capability of responding to critical observations on the lack of mathematics, be it rekenen or wiskunde, in Dutch Reform Math. What’s worse is that whereas Freudenthal, towards the end of his life, eventually came to face his educational failures, his school perceives a quite different reality, exemplified in a plenary lecture at one of these conferences by Marja van den Heuvel-Panhuizen titled ‘Reform under attack – Forty Years of Working on Better Mathematics Education thrown on the Scrapheap? No Way!‘ It’s still on the webpages of the Freudenthal Institute.
The first thing of MvdHP I read was an article in one of our quality newspapers, coauthored by Adri Treffers, one of the other Dutch professors of arithmetic.
Just like the conference paper it flatly denies the problems created by Dutch Reform Math, but it does offer an opening for a discussion in that it describes a realistic treatment of an exercise (not a problem) that we probably all agree young pupils should learn how to do. The bald problem is 62 − 57 = 5 and it is discussed in a so-called ‘realistic’ context deemed suitable by the professors: a guy stands on a weighing machine with his cat and reads off 62 kg, while without the cat he read off 57 kg (now that’s a realistic context these days). What’s the weight of the cat?
I understand this is an exercise for pupils in Year 5, in which 5 is 5 = 2 + 3, as we start counting the years from Kindergarten these days. So what would one expect from children of age 9 as far as simple subtractions are concerned? Hopefully something that goes beyond what you can do by counting upwards (from 57 in this case). The professors however had something else in their realistic minds and suggested a group discussion about the possibility of 6 or 4 kg as a possible outcome. I’m not joking.
At the time I did not know of the TAL project. I wrote about the books that resulted from this project in Dutch here, submitted to Euclides, the journal of and for the Dutch Society of high school teachers, but it was rejected because of the very topic. TAL is an acronym that refers to intermediate goals (Tussendoelen) and Leerlijnen (‘learning lines’, which translates as educational curricula). I read the TAL-books because I became interested in what had happened to elementary math school curricula, many of which now no longer contain standard topics like long division and calculating fractions with numerators and denominators. These books turned out to be part of the curricula at the academies for elementary schoolteachers. I started reading them under the false assumption that they were just using a different didactical method for teaching the same topics and I was curious to see how they did it. To make a long story short: I then found out they didn’t.