Here's a neat trick:
For example:
  • Start with 672
  • Reversing it gives 276
  • 672 - 276 is 396
  • 396 reversed is 693
  • 396 + 693 is ... ?

Compare your answer with the title of this page...
Enrichment: David Acheson has written a wonderful little book called "1089 and all that." Most highly recommended.
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