median
don steward
mathematics teaching 10 ~ 16

Thursday, 25 May 2017

fraction sequences

starts by counting on
fraction sequences with their 'simplest' (cancelled) form on the powerpoint
this could be done orally, with some explanations sought

then finding three missing terms and a general rule (nth term) for a fraction sequence
with (assumed) regular increases on the first resource
and a regular pattern (nth term) for the numerators and the denominators on the second resource

students might need nudging to consider equivalent fractions - hopefully not...



Tuesday, 23 May 2017

intervals of 10

variations on a theme






what is a general rule for the end numbers?

why?

Monday, 22 May 2017

zoom

  • place value, zooming in
  • reversing the question
  • generalising
  • harder generalising
a powerpoint, kind of illustrating the zooming in





Friday, 12 May 2017

half is in the middle




















what do students notice about the results?

why is that?

fraction addition denominators multiples

to start adding fractions it can be helpful if one denominator is a multiple of the other
so that only one denominator needs to be changed

in England such work is offered to 9 to 10 year olds (Y5)











fraction cancelling

powerpoint here





















sometimes, as in question (7), you only part-cancel a fraction in order to find the nth term rule
sometimes, for other fraction sequences, there is a stray fraction that cancels - not part of the general cancelling rule
some features of an overall generalisation are relatively easy to discern
and others aren't (for me anyway)

Wednesday, 3 May 2017