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RE: 9994 Squared = 99 880 036 - Can you calculate this in your head? - Let me teach you how.
The ancients had an intriguing level of understanding of many mathematical topics! This is certainly a great set of tools, though it has lost some of its usefulness with the advent of calculators. Nevertheless, interesting!
Indeed @chrishronc , I only recently learnt about this but love the concept!