This is an excellent post, thanks!
Could you add mine in the future?
Brainsteem Prize Maths Puzzles. Daily. Hopefully prizes will increase as still new. Current question:
https://steemit.com/mathematics/@rycharde/brainsteem-4-prize-maths-puzzle-factorials-free-3sbd
Thanks!
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all the best with your contest and it's been added to the list! :)