• How to Divide any Number by 5 in 2 Seconds

    Updated: 2024-02-28 16:07:02
    How to divide any number by 5 in 2 seconds or less using a math trick

  • Guess the Number in One Question

    Updated: 2024-02-27 20:27:24
    There are a lot of puzzles where you need to guess something asking only yes-or-no questions. In this puzzle, there are not two but three possible answers. Puzzle. Mike thought of one of three numbers: 1, 2, or 3. He is allowed to answer “Yes”, “No”, or “I don’t know”. Can Pete guess the number […]

  • Math Trick to Square Numbers from 50 to 59

    Updated: 2024-02-23 09:46:46
    Use this math trick to square numbers from 50 to 59 in 2 seconds or less

  • Sum of Consecutive Odd Numbers

    Updated: 2024-02-22 15:07:37
    Find the sum of consecutive odd numbers in 4 seconds or less

  • Sum of Consecutive Even Numbers

    Updated: 2024-02-22 15:05:45
    Here is how to find the sum of consecutive even numbers in 4 seconds or less using a trick.

  • Divide any 3-Digit Number by 99 in 3 seconds

    Updated: 2024-02-22 09:25:50
    Use this trick to divide any 3-digit number by 99 in 3 seconds or less

  • 5 Percent of any Number in 4 Seconds

    Updated: 2024-02-21 15:28:21
    Use this trick to find 5 percent of any number in 4 seconds or less.

  • Icosahedron’s Resistance

    Updated: 2024-02-21 01:24:47
    I rarely post physics puzzles, but this one is too good to pass on. Puzzle. A wireframe icosahedron is assembled so that each of its edges has a resistance of 1. What is the total resistance between opposite vertices of the icosahedron? While we are at it, another interesting question would be the following. Puzzle. […]

  • Multiply a Two Digit Number by 101 in one Second

    Updated: 2024-02-16 09:22:58
    Use this trick to multiply a two-digit number by 101 in one second or less

  • Ikigai

    Updated: 2024-02-14 20:19:19
    Have you ever heard of ikigai? The Japanese concept which gives four simple requirements for a happy career: I often think about it for myself and for my students. Is this good advice for finding a career path? I like that ikigai separates the first two requirements: passion and gift. Many of my students do […]

  • How to Solve a System of two Linear Equations Quickly

    Updated: 2024-02-13 16:26:40
    How to solve a system of two linear equations quickly (in 15 seconds or less!)

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