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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    That initial answer’s tens digits (t (u 1 • u 2)) is added back to step 3’s initial answer. A+B+C are then added together to reach a sum (D). Step 4 is where the units digit to step 3’s initial answer to: (u 1 • u 2) is attached (symbolized by: @) to the end of the sum of steps 1-3. Step 4 = D @ u (u 1 • u 2) = E

  3. Brain Age 2: More Training in Minutes a Day! - Wikipedia

    en.wikipedia.org/wiki/Brain_Age_2:_More_Training...

    Sign Finder - The player is given a series of math equations with an operator missing. The aim is to write the correct operator (+, -, *, or /) that makes the equation correct. Piano Player - The player is given a song to play on the piano and uses the touch screen to hit the keys as the music sheet progresses. There is also a Hard mode that ...

  4. Forgetting curve - Wikipedia

    en.wikipedia.org/wiki/Forgetting_curve

    Ebbinghaus's publication also included an equation to approximate his forgetting curve: [5] = (⁡ ()) + Here, represents 'Savings' expressed as a percentage, and represents time in minutes, counting from one minute before end of learning. The constants c and k are 1.25 and 1.84 respectively.

  5. Mental calculator - Wikipedia

    en.wikipedia.org/wiki/Mental_calculator

    The Mental Calculation World Cup is considered the most challenging and respected international competition that attempts to find the world's best mental calculator, and also the best at specific types of mental calculation, such as addition, multiplication, square root or calendar reckoning.

  6. 24 super wrong but brilliant test answers from the most ... - AOL

    www.aol.com/news/2014-08-21-27-super-wrong-but...

    Back-to-school season is here! Before you kick off the school year and dive back into all of those tests and essays, lighten it up by reading through these hysterical answers. Who knows, maybe you ...

  7. Cognitive reflection test - Wikipedia

    en.wikipedia.org/wiki/Cognitive_Reflection_Test

    The cognitive reflection test has three questions that each have an obvious but incorrect response given by system 1. The correct response requires the activation of system 2. For system 2 to be activated, a person must note that their first answer is incorrect, which requires reflection on their own cognition. [2]

  8. Monty Hall problem - Wikipedia

    en.wikipedia.org/wiki/Monty_Hall_problem

    The answer to the first question is ⁠ 2 / 3 ⁠, as is shown correctly by the "simple" solutions. But the answer to the second question is now different: the conditional probability the car is behind door 1 or door 2 given the host has opened door 3 (the door on the right) is ⁠ 1 / 2 ⁠.

  9. Encephalization quotient - Wikipedia

    en.wikipedia.org/wiki/Encephalization_quotient

    Encephalization quotient (EQ), encephalization level (EL), or just encephalization is a relative brain size measure that is defined as the ratio between observed and predicted brain mass for an animal of a given size, based on nonlinear regression on a range of reference species.