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  • 90-60=
    30
  • 10+10+
    20
  • 70+30=
    100
  • 90-30=
    60
  • 70-20=
    50
  • 100-20=
    80
  • 20+40=
    60
  • 10+40=
    50
  • 100-30=
    70
  • 30+40=
    70
  • 100-80=
    20
  • 70-60=
    10
  • 50+40=
    90
  • 50+30=
    80
  • 20+20=
    40
  • 100-60=
    40
  • 20+10=
    30
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