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Subtracting 1-digit from 2-digits

2W have been working practically to exchange one ten for ten ones to help us with our subtracting.

  • IMG0936.JPG
    41583
  • IMG0937.JPG
    41582
  • IMG0938.JPG
    41581
  • IMG0939.JPG
    41580
  • IMG0940.JPG
    41579
  • IMG0941.JPG
    41578