Is Heuristics misleading your Judgment?

I recollect a poem during my school days where the little girl finds it difficult to remember 6 multiplied by 9 while learning the table of 6. So she creates a mental shortcut and says 6 multiplied by 9 is ‘doll’. And assigns 54 to a doll. During exams she remembers ‘doll’ and forgets 54. …