An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
Choose any three by three square of dates on a calendar page...
Can you create a Latin Square from multiples of a six digit number?
Each pentagon has a turn of 36o to pack against its neighbour.
Therefore it will take 10 (x36o) turns to complete a full-turn, i.e. 10 pentagons
This problem is taken from the UKMT Mathematical Challenges.