when you get to 5x + x = 6x, you can't simply memorize a similar sequence. Knowing how the sequence is created is much more valuable than memorizing the sequenc

when you get to 5x + x = 6x, you can't simply memorize a similar sequence. Knowing how the sequence is created is much more valuable than memorizing the sequence. You do loose some speed, but critical thinking is more important than speed, especially with the onset of cheap personal computers and calculators.