We are IESO Elortzibar's Bilingual Programme students of the first course of ESO.
Althoug Maths is our main topic, almost anything interesting fits in Frikimaths: sience, music, movies...
Some students
have to take a test in 9 minutes. Due to an electromagnetic pulse, every watch has
stopped working and we only have two hourglasses to measure time. These two hourglasses (the only ones we have in the high-school) last
for 7’ the
first one and 4’
the second one.
How can we measure exactly 9
minutes (neither one second longer, nor shorter) using these hourglasses? Tip: try to start both hourglasses at the same time.
What happens after exactly 4 minutes? Deadline: October the 25th. Printable version available. And we continue with the 90's...
Ismael visits a
one-floor castle with 64 rooms connected as described in the image below. He
starts in the bathroom (the black square)
and since he feels sooooo relieved he wants to visit the 64 rooms using only 15 straight lines. Would you be able
to help Ismael and draw a path for him starting at the balck square and using
only 15 different lines ( without removing the pencil from the sheet) so he
manages to visit the 64 rooms?
Watch it: You MUST start your trip from the black spot, but you can finish it
wherever you want. Notice there’s one missing connection between two towns at
the bottom of the drawing.
