Double trouble from Martin Gardner
Martin Gardner, who wrote dozens of books of recreational mathematics, would have been 102 last Friday. In the years since he died, his friends and fans have started a global movement called Celebration of Mind, which encourages people to put on puzzle-themed events on or around the date of his birthday.
Please celebrate your minds right now by attempting these two gems from Gardners archive. One is straightforward. The other may take you a little longer.
1. At the hardware store, you are told that 1 will cost you 50p, 12 will cost 1 and the price of 144 is 1.50. What are you buying?
2. Reconstruct the following long division: