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Tens Block Subtraction Magic!

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  • 25 - 13 = ?
    12
  • 36 - 15 = ?
    21
  • 12 - 10 = ?
    2
  • 19 - 12 = ?
    7
  • 25 - 15 = ?
    10
  • 27 - 21 = ?
    6
  • 45 - 23 = ?
    22
  • 52 - 21 = ?
    31
  • 34 - 31 = ?
    3
  • 45 - 24 = ?
    21
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