(3 4/5 + 7/8) - 3/8 = (3 + 4/5 + 7/8) - 3/8= (3 + 32/40 + 35/40) - 3/8= (3 + 67/40) - 3/8= (3*40/40 + 67/40) - 3/8= (120/40 + 67/40) - 3/8= (187/40) - 3/8= (187/40) - 15/40= (187 - 15)/40= 172/40= 4 12/40= 4 3/10
(5 4/9 + 5/12) - 1/9 = (5 + 4/9 + 5/12) - 1/9= (5 + 48/108 + 45/108) - 1/9= (5 + 93/108) - 1/9= (540/108 + 93/108) - 1/9= (633/108) - 1/9= (633 - 12)/108= 621/108= 5 61/108
12 1/6 - (5/6 + 16/15) = 12 1/6 - (25/30 + 32/30)= 12 1/6 - 57/30= (12 + 6/6) - 57/30= (12 + 180/30) - 57/30= (192/30) - 57/30= (192 - 57)/30= 135/30= 4 15/30= 4 1/2
(3 4/5 + 7/8) - 3/8 = (3 + 4/5 + 7/8) - 3/8
= (3 + 32/40 + 35/40) - 3/8
= (3 + 67/40) - 3/8
= (3*40/40 + 67/40) - 3/8
= (120/40 + 67/40) - 3/8
= (187/40) - 3/8
= (187/40) - 15/40
= (187 - 15)/40
= 172/40
= 4 12/40
= 4 3/10
(5 4/9 + 5/12) - 1/9 = (5 + 4/9 + 5/12) - 1/9
= (5 + 48/108 + 45/108) - 1/9
= (5 + 93/108) - 1/9
= (540/108 + 93/108) - 1/9
= (633/108) - 1/9
= (633 - 12)/108
= 621/108
= 5 61/108
12 1/6 - (5/6 + 16/15) = 12 1/6 - (25/30 + 32/30)
= 12 1/6 - 57/30
= (12 + 6/6) - 57/30
= (12 + 180/30) - 57/30
= (192/30) - 57/30
= (192 - 57)/30
= 135/30
= 4 15/30
= 4 1/2