median
don steward
mathematics teaching 10 ~ 16

Friday, 26 February 2010

four operations

choose any two numbers
  • add them
  • take them
  • multiply them
  • divide them
sum these four results

try to obtain 36

there are three ways you can do this

try to also find:
  • one way to make 80
  • two ways to make 81
  • one way to make 75

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