Comments by "" (@mina86) on "Talks at Google" channel.

  1. +The Andrewcc7 Gamer Number of thousands in the answer tells you the first digit and the last digit of the answer tells you the second digit. For the number of thousands N you have to find a single-digit number M such that M³ ≤ N < (M+1)³. For example, if the number was 58, you get 58³ = 195112 so number of thousands is 195 and we can observe: 5³ = 125 ≤ 195 < 216 = 6³. So you just need to memorise cubes of all digits. For the last digit (in our example 2), you need to remember the following mapping: 0 0 1 1 2 8 3 7 4 4 5 5 6 6 7 3 8 2 9 9 Where does it come from? It is mapping of last digit from a cube of a digit to that digit (so really you remember the same thing as for thousands). E.g. 3³ = 27, last digit is 7 so if 7 is the last digit in the answer, 3 was the starting number.
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