Subtraction – old and new approaches

by ellenmanson on May 21, 2014

If you learnt to subtract two numbers by “carrying the one” but did not fully understand the reasoning behind the renaming/regrouping involved, then the following post may be insightful.

Read more: http://www.businessinsider.com/how-common-core-subtraction-works-2014-5#ixzz32JbMI1Bq

 

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Questions for Promoting Mathematical Thinking

by ellenmanson on April 4, 2014

We can use the following questions to help students:

…. work together to make sense of mathematics

  • What do others think about what _____ said?
  • Do you agree? Disagree?
  • Does anyone have the same answer but a different way to explain it?
  • Would you ask the rest of the class that question?
  • Do you understand what they are saying?
  • Can you convince the rest of us that makes sense?

… rely more on themselves to determine whether something is mathematically correct

  • Why do you think that?
  • Why is that true?
  • How did you reach that conclusion?
  • Does that make sense?
  • Can you make a model to show that?

… learn to reason mathematically

  • Does that always work?
  • Is that true for all cases?
  • Can you think of another example?
  • How could you prove that?

… learn to conjecture, invent, and solve problems

  • What would happen if…?
  • Do you see a pattern?
  • What are some other possibilities here?
  • Can you predict the next one?  Can you go backward one?
  • How did you think about the problem?
  • What decision do you think __________ should make?
  • Can you compare your solution with _______’s?  What is alike?  What is different?

… connect mathematics, its ideas and its applications

  • How does this relate to ________?
  • What ideas have we learned before that might be useful in solving this problem?
  • Have we ever solved a problem like this one before?  Can you give an example?
  • What uses of mathematics did you find (in the paper, in a magazine, on TV)?
  • Can you give me an example of where you might see _______?

*Adapted from the Professional Standards (NCTM, 1991, p. 3-4)

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Another great Pi Day!

March 14, 2014
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An interesting article about math anxiety

March 13, 2014

Mothers, Don’t Pass On Math Anxiety To Your Daughters According to Elizabeth Gunderson, a researcher at the University of Chicago, the “adult-to-child transmission” of attitudes about learning—in particular, how mothers’ unease with mathematics, may be passed down to their daughters. Parents’ “own personal feelings about math are likely to influence the messages they convey about […]

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Math Olympiad Practice Problems – 5 March

March 6, 2014

Problems – 5 March Answers – 5 March

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Pi Day – Friday 14th March

March 4, 2014

Which lucky LS teachers will have pie on their face on Pi Day!?! The following Lower School Administrators, Specialist and Grade 3 – 6 teachers have volunteered to go into the lucky draw to be ‘pie’d’ on Pi Day, Friday 14th March. This fun activity will take place during the Grade 3-6 lunchtime in the […]

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March into Math – Parent Seminars

February 27, 2014

Tap on the image to enlarge.

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Math Olympiad Practice Problems – 26 Feb

February 26, 2014

Problems – 26 Feb Answers – 26 Feb

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Announcing March into Math 2014!

February 24, 2014

                Last academic year in the Lower School we held our first ever ‘March into Math’ in support of our PYP mathematics programme. It was a great success; one we hope will become a tradition at CDNIS. This academic year we will officially begin our ‘March into Math’ […]

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Math Olympiad Practice Problems – 17 Feb 2014

February 18, 2014

Answers 17 Feb 2014 Practice Problems 17 Feb 2014

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