9 x ( 5 x 20 ) = ( 9 x 5 ) x 20 =
5 + ( 20 + 40 ) = ( 5+ 20 ) +40 =
( 85 x 4 ) x 10 = 85 x ( 4 x 10 ) =
( 65 + 40 ) + 36 = 65 + ( 40 + 36 ) =
20 x ( 5 x 4 ) = ( 20 x 5 ) x 4=
65 + ( 56 + 30) = (65 + 56 ) + 30 =
145 + ( 58 + 158 ) = ( 145 + 58 ) + 158 =
52 x (11 x 2) = ( 52 x 11 ) x 2 =
( 15 + 36 ) + 115 = 15 + ( 36+115 )=
65 x (3 x 5) = ( 65 x 3 ) x 5
3400
900
151
1300
141
166
361
65
1144
400