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addition and subtraction within 1000 with no reg ...

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  • 539 - 434
    105
  • 823 + 123
    946
  • 325 + 523
    848
  • 142 + 531
    673
  • 853 - 432
    421
  • 747 + 221
    968
  • 153 + 736
    889
  • 986 - 745
    241
  • 689 - 563
    126
  • 459 - 346
    113
  • 963 - 621
    342
  • 759 - 525
    234
  • 111 + 222
    333
  • 848 - 734
    114
  • 633 + 134
    767
  • 513 + 155
    668
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