(1)( ) - 10 = 2 (2)14 - ( )= 10 (3)17 +( ) = 18 (4)7 + ( )= 20 (5) ( )- 5 = 3 (6)18 -( ) = 7 (7)( ) - 10 = 4 (8)( ) - 4 = 9 (9)1 +( ) = 11 (10)15 -( ) = 1 (11)3 -( ) = 1 (12)( ) + 3 = 12 (13)( ) - 11 = 5 (14)( ) - 2 = 3 (15)18 -( ) = 3
