median
don steward
mathematics teaching 10 ~ 16

Monday, 28 March 2016

double glazing costs

the 'Warmsnug Double Glazing' task comes from the 'Language of Functions and Graphs' (Red Box) resources produced by the Shell Centre (1985) and available in pdf form

this task has been developed by NRICH

two variables are initially involved
students can decide what these are likely to be

one of the pricings is (intentionally) incorrect


















NRICH also have a spreadsheet for this task that enables other (version 1) and harder questions to be posed:
  • two variables plus a fixed rate (version 2)
  • three variables (version 3)

these are further examples of version 1 (just with two variables)





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