Tanya Khovanova's Math Blog

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Blog.tanyakhovanova.com news digest

  • 1 month

    The Weight of a 1-Kilo Brick

    My goal is to expand my students’ minds. So, though my STEP program is about mathematics, I sometimes give problems from other areas for homework. Here is a recent physics one.
    Puzzle. You have a brick of 1 kilogram. How does the weight of the brick change during the year?...

  • 1 month

    Missing 5

    Here is a probability puzzle I heard from my son Sergei. We even included this puzzle in our book Mathematical Puzzles and Curiosities. Our book includes the answer but omits the details. So, this blog post is devoted to said details.
    Puzzle. Alice rolls a die until she gets 6. Then Bob observes that she never rolled a 5....

  • 1 month

    Two Points on a Cube

    I wrote a book. This is my first book, so I am very proud. I wrote it together with two brilliant puzzle lovers, Ivo Fagundes David de Oliveira and Yogev Shpilman. The book is published by World Scientific and is available for pre-order: Mathematical...

  • 1 month

    A New Twist in a Famous Problem

    I recently gave my STEP students a question from our old 2014 PRIMES entrance test.
    Puzzle. John’s secret number is between 1 and 216 inclusive, and you can ask him yes-or-no questions, but he may lie in response to one of the questions. Explain how to determine his number in 21 questions....

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