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Adding and Subtracting Within 20

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  • eight-one=
    seven
  • seven-three=
    four
  • twenty-ten=
    ten
  • nine+nine=
    eighteen
  • seven+four=
    eleven
  • nine-seven=
    two
  • six+eight=
    fourteen
  • fifteen-two=
    therteen
  • ten-six=
    four
  • seven+seven=
    fourteen
  • seven+three=
    ten
  • ten-four=
    six
  • two+two=
    four
  • thirteen-five=
    eight
  • thirteen-eight=
    five
  • six-two=
    four
  • three+three=
    six
  • sixteen-eight=
    eight
  • four+five=
    nine
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