• Match!!@pawb.social
    link
    fedilink
    English
    arrow-up
    2
    ·
    8 months ago

    getting correct within a factor of 2 after a 42-fold exponentiation would be amazingly good mental math

    • AeroLemming@lemm.ee
      link
      fedilink
      English
      arrow-up
      2
      ·
      8 months ago

      The easiest way would be to say 117 billion is ~2^37 because 2[1] are 128, 1024, and about a million (1024*1024), so multiplying those all together gives a little over 128 billion, which is pretty close to 117 billion. So, 242/237=2^5=32. Pretty close, all mental math. Granted, it does require you to either memorize or compute powers of 2 up to 10.


      1. 7, 10, 20 ↩︎