90% of 20 =
                   ( 18 )

30% of 50 =
                   (       )

90% of 10 =
                   (       )

40% of 60 =
                   (       )

80% of 80 =
                   (       )

90% of 70 =
                   (       )

10% of 20 =
                   (       )

10% of 70 =
                   (       )

90% of 10 =
                   (       )

          +[         ]

80% of 4 =
                   ( 3.2 )

30% of 9 =
                   (       )

20% of 8 =
                   (       )

80% of 2 =
                   (       )

10% of 9 =
                   (       )

80% of 3 =
                   (       )

90% of 3 =
                   (       )

90% of 5 =
                   (       )

60% of 7 =
                   (       )

          +[         ]

40% of 1 =
                   ( 0.4 )

60% of 8 =
                   (       )

70% of 3 =
                   (       )

30% of 1 =
                   (       )

1% of 50 =
                   (       )

70% of 1 =
                   (       )

50% of 8 =
                   (       )

70% of 6 =
                   (       )

90% of 1 =
                   (       )

          +[         ]

       ++[[            ]]