(10-23-2017 11:23 AM)Didier Lachieze Wrote: [ -> ]Did you try this link: Alex Bellos's Monday puzzle? There is also this one from the New York Times: Numberplay.
(10-23-2017 09:45 AM)Gerald H Wrote: [ -> ]A problem for more mature students: https://www.theguardian.com/science/2017...5-year-old