The Moscow PuzzlesBoris A. Kordemsky
The Moscow Puzzles
by Boris A. Kordemsky · first published 1978
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…dreams with a devil who won't stop telling him about elementary number theory, using various dream-world props. If you want more problems after that, there are a lot of great puzzles in Kordemsky's The Moscow Puzzles https://archive.org/details/moscowpuzzles3590000kord_m9a0, or you could take a look at Fomin, Genkin, & Itenberg's Mathematical Circles: Russian Experience which your kid could probably just about handle.…
on “A seventh-grader student found a beautiful proof to Thales' Theorem (2002)” ↗…punishment. If anyone wants some primary school appropriate word problems, let me recommend the collections by Lenchner, e.g. https://archive.org/details/mathematicalolym0000lenc Also try Kordemsky’s Moscow Puzzles https://archive.org/details/boris-a.-kordemsky-the-moscow-pu...
on “Creativity fundamentally comes from memorization?” ↗Another fantastic resource is Boris Kordemsky's book The Moscow Puzzles: https://www.amazon.com/Moscow-Puzzles-Mathematical-Recreatio...
on “Math and puzzle fans find magic in Martin Gardner's legacy” ↗