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Quarter the Cross
At the end of last year, the MTBoS (Math(s) Twitter Blog-o-Sphere) introduced me to this very interesting task: you have a cross made of four equal squares, and you are supposed to colour in exactly 1/4 of the cross and justify why you know it’s a quarter. I call it “Quarter the Cross”.
(The teachers who […]
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The Sausage-Stacking Theorem
It’s no secret that the powers of two are some of my favourite numbers. There are so many interesting things to say about them that often I don’t know where to begin! (In case you’re not au fait with the terminology, the powers of two are the numbers you can make by starting with 1 […]
Does it matter that roosters don’t lay eggs?
There is a particularly annoying puzzle that goes something like this:
“A rooster sits on the apex of a barn roof. The roof pitches at an angle of 43 degrees above the horizontal and is made of wood painted red. On the northern side of the roof, there is a large tree which casts a shadow […]
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Individual Ahas
At the Hmm… Sessions in November, something cool happened when a couple of the students were showing the rest of us the solution to a puzzle. (Update: Later this year, the Hmm Sessions were renamed “One Hundred Factorial” after the first puzzle we ever did.)
(For those who don’t know, The Hmm… Sessions are a regular […]
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