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Adding and substracting

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  • nineteen minus eight
    eleven
  • ten minus ten
    zero
  • thirteen minus two
    eleven
  • twelve minus five
    seven
  • seventeen minus eight
    nine
  • twenty minus thirteen
    seven
  • twenty minus six
    fourteen
  • nineteen plus one
    twenty
  • six plus twelve
    eighteen
  • seven plus seven
    fourteen
  • two plus eight
    ten
  • fourteen plus six
    twenty
  • eighteen minus ten
    eight
  • twenty minus eight
    twelve
  • four plus eleven
    fifteen
  • nine plus four
    thirteen
  • ten plus ten
    twenty
  • eight plus three
    eleven
  • fifteen plus three
    eitghteen
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