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table filled with plus and minus signs, where they take turns crossing out rows and columns.

For additional preparation, you can browse the full archive of past tasks or review categorized problems on Shkolkovo . Fourty seventh Tournament of Towns, 2025 – 2026 table filled with plus and minus signs, where

A problem involving a 60-digit number made of ones and eights, requiring a proof of divisibility by a 30-digit number consisting only of nines. table filled with plus and minus signs, where

The materials for the include problems and solutions for both the Fall and Spring rounds. table filled with plus and minus signs, where