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Mental math

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  • 2+9=
    Eleven
  • 90+90=
    One hundred eighty
  • 100-30=
    Seventy
  • 500-200=
    Three hundred
  • 8+8=
    Sixteen
  • 13+5=
    Eighteen
  • 170-50=
    Twenty
  • 20-8=
    Twelve
  • 107+7=
    One hundred fourteen
  • 12-10=
    Two
  • 15+15=
    Thirty
  • 6+11=
    Seventeen
  • 104+5=
    One hundred and nine
  • 99-10=
    Eighty -nine
  • 40-9=
    Thirty -one
  • 18+4=
    Twenty -two
  • 30-5=
    Twenty -five
  • 70-10=
    Sixty
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