I really like some of the questions found on the Openmiddle.com website. It is a great resource for questions that really get students thinking. They are often formatted so that there is a very low threshold for entry to the problem but they allow for enrichment and extensions. I created the problem below for a professional development session for Math 10 teachers. Students in the Math 10 course are near the following outcome in the yearly plan: AN03 Students will be expected to demonstrate an understanding of powers with integral and rational exponents. Fill in the boxes with whole numbers 1 through 6, using each number at most once, so that the value of the expression is as large (or as small) as possible.
In order to verify that these were correct values, I wrote a short program in Python (see below) to check all of the 720 possible (6!) values. It was my personal Hour of Code activity. I`m just learning to use Python so my code could definitely be more efficient. If you can write some better code, let me know and I`ll post it here and give you credit. ValuesList=[1.0,2.0,3.0,4.0,5.0,6.0] largest = 0 smallest = 10000 for i in ValuesList: for j in ValuesList: for k in ValuesList: for l in ValuesList: for m in ValuesList: for n in ValuesList: if i!=j and i!=k and i!=l and i!=m and i!=n and j!=k and j!=l and j!=m and j!=n and k!=l and k!=m and k!=n and l!=m and l!=n and m!=n: z=((i/j)**k)*(l**(m/n)) if z > largest: largest = z print "Largest",largest,i,j,k,l,m,n if z < smallest: smallest = z print "Smallest",smallest,i,j,k,l,m,n Update: I submitted this problem to the OpenMiddle.com website and it has been posted there. EL
2 Comments
12/28/2015 11:06:35 am
LOVE this question! It really makes them think. Could you use it at the grade 9 level too?
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Erick Lee
1/4/2016 08:34:06 am
Hi Heather, You could use this for grade 9 but rational exponents is not an outcome for them. They would be evaluating this with a calculator however so they should still be able to explore the equations generated by this problem. My favourite Open Middle problem for grade 9 exponents is http://www.openmiddle.com/exponentsandorderofoperations/
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