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Addition and Subtraction with and without regrou ...

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  • 76-33
    43
  • 622+775
    1,397
  • 69-38
    31
  • 24+32
    56
  • 44-17
    27
  • 538-181
    357
  • 476+333
    809
  • 47 + 65
    112
  • 83+40
    123
  • 53+18
    71
  • 41+29
    70
  • 62-38
    24
  • 329-241
    88
  • 137+254
    391
  • 80-45
    35
  • 35+20
    55
  • 429+154
    583
  • 35-21
    14
  • 319-281
    38
  • 76-39
    37
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