Simple Addition

  • ( 1 ~ 9 ) + 1
  • ( 1 ~ 9 ) + 2
  • ( 1 ~ 9 ) + 3
  • ( 1 ~ 9 ) + 4
  • ( 1 ~ 9 ) + 5
  • ( 1 ~ 9 ) + 6
  • ( 1 ~ 9 ) + 7
  • ( 1 ~ 9 ) + 8
  • ( 1 ~ 9 ) + 9
  • ( 1 ~ 9 ) + ( 1 ~ 9 )

    • Simple Subtraction

  • ( 1 ~ 9 ) - 1
  • ( 1 ~ 9 ) - 2
  • ( 1 ~ 9 ) - ( 1 ~ 2 )
  • ( 1 ~ 9 ) - 3
  • ( 1 ~ 9 ) - ( 1 ~ 3 )
  • ( 1 ~ 9 ) - 4
  • ( 1 ~ 9 ) - ( 1 ~ 4 )
  • ( 1 ~ 9 ) - 5
  • ( 1 ~ 9 ) - ( 1 ~ 5 )
  • number - 6 = ( 1 ~ 9 )
  • number - (1~6) = ( 1 ~ 9 )
  • number - 7 = ( 1 ~ 9 )
  • number - (1~7) = ( 1 ~ 9 )
  • number - 8 = ( 1 ~ 9 )
  • number - (1~8) = ( 1 ~ 9 )
  • number - 9 = ( 1 ~ 9 )
  • number - ( 1 ~ 9 ) = ( 1 ~ 9 )

    • Number Patterns

  • Increasing ( 1 ~ 9 )
  • Increasing ( 10 ~ 19 )
  • Increasing ( 20 ~ 19 )
  • Increasing ( 1 ~ 29 )
  • Decreasing ( 5 ~ 9 )
  • Decreasing ( 10 ~ 19 )
  • Decreasing ( 20 ~ 29 )
  • Decreasing ( 5 ~ 29 )

    • Time： Read Hours on a Clock

  • ( 1 ~ 6 ) O'Clock
  • ( 6 ~ 12 ) O'Clock
  • ( 1 ~ 12 ) O'Clock

    • ;