Here are the step by step walkthrough and answers to Calculator The Game levels 111 to 120.
Calculator The Game Level 111 – SHIFT>, x3, SHIFT>, 9 = 129
Calculator The Game Level 112 – +1, <SHIFT, +/-, +1, +/- = 210
Calculator The Game Level 113 – SHIFT>, +2, SHIFT>, +2, 12=>0 = 210
Calculator The Game Level 114 – +5, 0, Calculator The Game Level 115 – <SHIFT, +11, 3=>1, SUM = 3
Calculator The Game Level 116 – SHIFT>, -2, /3, SHIFT> = 121
Calculator The Game Level 117 – REVERSE, 25=>12, REVERSE, 12=>5, 25=>12, 21=>3 = 13
Calculator The Game Level 118 – SHIFT>, SHIFT>, 25=>525, 51=>5, 50=>0 = 520
Calculator The Game Level 119 – MIRROR = 2332
Calculator The Game Level 120 – 1, 2, MIRROR = 1221
