Looks like American Express is sending out a fascinating little calculator as a promotional item. I haven’t seen one myself, but here are some of the results, as reported by Contentious:

  • 100 – 10 = 10
  • 7.1 + 3.4 = 24.14
  • 144.35 + 525 = 75,783.75
  • 246 – 13 = 18.923076