1 (The Role of) Mental Imagery in the Teaching and Learning of Mathematics John Mason Tower Hamlets June 08.

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Presentation transcript:

1 (The Role of) Mental Imagery in the Teaching and Learning of Mathematics John Mason Tower Hamlets June 08

2 Conjectures  Mental imagery is perhaps THE fundamental power possessed by humans –It is the basis for planning and for carrying out plans; –It is the root of expectation and the mechanism for motivation –It is the basis for algebra and geometry

3 Outline  Some tasks (paration)  Some reflection (post-paration)  Some pre-paration

4 Imagine …  A straight line …

5 Backwards Arithmetic  When I call out a number, you must write it down from right to left, with the units digit on the left Useful Strategy: impose an unusual constraint so as to force yourself to bring internalised procedures to the surface

6 Tulips

7 Kites

8 CopperPlate Calculations

9 What’s Being Done?  Does ‘it’ always work?  What is the it? The calculation comes from an Arabic manuscript Hindu Reckoning written by Kushyar ibn-Lebban about 1000 C.E. (quoted in NCTM 1969 p133)

10 Layout Treviso and Pacioli Multiplications Historical Topics for the Mathematics Classroom, NCTM p

11 Construction

12 Construction

13 Raise your hand when you can see  Something which is 2/5 of something  Something which is 3/5 of something  Something which is 2/3 of something –What others can you see?  Something which is 1/3 of 3/5 of something  Something which is 3/5 of 1/3 of something  Something which is 2/5 of 5/2 of something  Something which is 1 ÷ 2/5 of something

14 What fractions can you ‘see’?  What relationships between fractions can you see?

15 Using Mental Imagery  When planning a lesson  When reflecting on a lesson  When introducing a lesson or a task  Getting learners to use their imagery –Anticipating –Predicting –Going beyond the physically possible