10% of 80 =
                   ( 8 )

80% of 40 =
                   (       )

90% of 80 =
                   (       )

40% of 60 =
                   (       )

90% of 70 =
                   (       )

90% of 60 =
                   (       )

10% of 10 =
                   (       )

60% of 40 =
                   (       )

10% of 80 =
                   (       )

          +[         ]

80% of 2 =
                   ( 1.6 )

4% of 80 =
                   (       )

2% of 70 =
                   (       )

8% of 90 =
                   (       )

1% of 90 =
                   (       )

80% of 1 =
                   (       )

50% of 2 =
                   (       )

10% of 3 =
                   (       )

70% of 4 =
                   (       )

          +[         ]

90% of 9 =
                   ( 8.1 )

10% of 8 =
                   (       )

7% of 20 =
                   (       )

40% of 9 =
                   (       )

1% of 40 =
                   (       )

80% of 9 =
                   (       )

5% of 80 =
                   (       )

30% of 5 =
                   (       )

5% of 80 =
                   (       )

          +[         ]

       ++[[            ]]