median
don steward
mathematics teaching 10 ~ 16

Saturday, 8 November 2014

mobile moments

the diagrams are sketches, the numbers on the bars show the ratios or proportions along the bars
















Dean Ballard's fibonacci mobile







a more recent, colourful version - showing the sub-units











as Dean points out, this version for 13 along the top 'bar' builds from the sub-versions for 8 and 5:


















Erich Friedman's weight puzzles are also interesting...
there are puzzles for 5 consecutive numbers right up to 20 consecutive numbers



place weights 1 to 5 so that this mobile balances
place weights 1 to 5 so that this mobile balances



place weights 1 to 6 so that this balances





place weights 1 to 7 so that this balances






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