Wrong, But Useful: Episode 39

In this month's Christmassy episode of Wrong, But Useful, @reflectivemaths and I discuss:

  • Number of the podcast: 9Number 9. Number 9.
  • Shout outs to:
    • @aap03102 (Chris Smith) for his maths newsletter
    • @mathistopheles (Thomas Oléron Evans) and @fryrsquared (Hannah Fry) for sending me a copy of their book
    • @chalkdustmag for the lovely card
  • @fryrsquared - The Joy of Data on BBC four
  • Mathematics exhibition at the Science Museum
  • “Did you know that the incircle of a 3-4-5 triangle has radius 1?”
  • (Via @arithmaticks): owt to the nowt = 1
  • Class “Girls were better than boys by 1”
  • (Via @danicquinn): How would you do 12.5 x 140 ?
  • (Via @christianp): suppose you want students to round -2.3. You round it to the nearest…?
  • New GCSE mocks
  • @jamesgrimes’s personalised video for Dave and his classes and his MathsJam talk
  • Puzzles:
    • From Ep 37: 2, 3 and 7 are the three numbers whose reciprocals don’t reach 1, but get as close as possible. Gold stars to @fenneklyra, @chrishazell72, @dragon_dodo, and @aap03102
    • From Ep 38: Another gold star to @FennekLyra for solving the 100! Puzzle, which we won’t give away the answer to.
    • How many gifts are there, in total, in the Twelve Days of Christmas? And what do you end up with most of? What if there were 24 days of Christmas?


Colin is a Weymouth maths tutor, author of several Maths For Dummies books and A-level maths guides. He started Flying Colours Maths in 2008. He lives with an espresso pot and nothing to prove.


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