78 < 87
89 = 89
82 - 44 = 38; 81 - 45 = 36; 38 > 36
44 + 55 = 99; 55 + 35 = 90; 99 > 90
55 - 31 = 24; 15 + 16 = 31; 24 < 31
40 : 5 = 8; 40 : 8 = 5; 8 > 5