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Use addition to subtract

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  • 50 - 50 = ?
    50 + 0 = 50
  • 31 - 1 = ?
    30 + 1 = 31
  • 30 - 30 = ?
    30 + 0 = 30
  • 60 - 10 = ?
    10 + 50 = 60
  • 50 - 10 = ?
    10 + 40 = 50
  • 15 - 2 = ?
    2 + 13 = 15
  • 80 - 70 = ?
    10 + 70 = 80
  • 70 - 20 = ?
    20 + 50 = 70
  • 90 - 80 = ........
    10 + 80 = 90
  • 90 - 30 = ?
    30 + 60 = 90
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