From this website you can choose a whole variety of interesting problems to explore that are categorised into age groups and levels of difficulty, so learners can select those appropriate for them. They even publish some submitted solutions!

Mathematical Snacks from the ATM

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A small group of people, Geoff Faux, Pip Huyton, Peter Lacey, Mike Ollerton, Colin Taylor and Helen Williams, all of whom are members of the Association of Teachers of Mathematics, voluntarily created a collection of 2-minute videos, which the ATM have freely circulated; they were initially for use during COVID-19 Lockdown. However, because of the positive responses the ATM have received, we believe the videos might also be used as resources in mathematics classrooms. If you like these then why not join with us in the ATM community at www.atm.org.uk/Membership-Types

Any feedback about how children work on these snacks would be greatly appreciated.