OK, let's crack this. We're given 80 and our task is to multiply it by 168. Essentially, we'll be adding 80 to itself 168 times.
Step 1: 0 + 80 = 80
Step 2: 80 + 80 = 160
Step 3: 160 + 80 = 240
Step 4: 240 + 80 = 320
Step 5: 320 + 80 = 400
Step 6: 400 + 80 = 480
Step 7: 480 + 80 = 560
Step 8: 560 + 80 = 640
Step 9: 640 + 80 = 720
Step 10: 720 + 80 = 800
Step 11: 800 + 80 = 880
Step 12: 880 + 80 = 960
Step 13: 960 + 80 = 1040
Step 14: 1040 + 80 = 1120
Step 15: 1120 + 80 = 1200
Step 16: 1200 + 80 = 1280
Step 17: 1280 + 80 = 1360
Step 18: 1360 + 80 = 1440
Step 19: 1440 + 80 = 1520
Step 20: 1520 + 80 = 1600
Step 21: 1600 + 80 = 1680
Step 22: 1680 + 80 = 1760
Step 23: 1760 + 80 = 1840
Step 24: 1840 + 80 = 1920
Step 25: 1920 + 80 = 2000
Step 26: 2000 + 80 = 2080
Step 27: 2080 + 80 = 2160
Step 28: 2160 + 80 = 2240
Step 29: 2240 + 80 = 2320
Step 30: 2320 + 80 = 2400
Step 31: 2400 + 80 = 2480
Step 32: 2480 + 80 = 2560
Step 33: 2560 + 80 = 2640
Step 34: 2640 + 80 = 2720
Step 35: 2720 + 80 = 2800
Step 36: 2800 + 80 = 2880
Step 37: 2880 + 80 = 2960
Step 38: 2960 + 80 = 3040
Step 39: 3040 + 80 = 3120
Step 40: 3120 + 80 = 3200
Step 41: 3200 + 80 = 3280
Step 42: 3280 + 80 = 3360
Step 43: 3360 + 80 = 3440
Step 44: 3440 + 80 = 3520
Step 45: 3520 + 80 = 3600
Step 46: 3600 + 80 = 3680
Step 47: 3680 + 80 = 3760
Step 48: 3760 + 80 = 3840
Step 49: 3840 + 80 = 3920
Step 50: 3920 + 80 = 4000
Step 51: 4000 + 80 = 4080
Step 52: 4080 + 80 = 4160
Step 53: 4160 + 80 = 4240
Step 54: 4240 + 80 = 4320
Step 55: 4320 + 80 = 4400
Step 56: 4400 + 80 = 4480
Step 57: 4480 + 80 = 4560
Step 58: 4560 + 80 = 4640
Step 59: 4640 + 80 = 4720
Step 60: 4720 + 80 = 4800
Step 61: 4800 + 80 = 4880
Step 62: 4880 + 80 = 4960
Step 63: 4960 + 80 = 5040
Step 64: 5040 + 80 = 5120
Step 65: 5120 + 80 = 5200
Step 66: 5200 + 80 = 5280
Step 67: 5280 + 80 = 5360
Step 68: 5360 + 80 = 5440
Step 69: 5440 + 80 = 5520
Step 70: 5520 + 80 = 5600
Step 71: 5600 + 80 = 5680
Step 72: 5680 + 80 = 5760
Step 73: 5760 + 80 = 5840
Step 74: 5840 + 80 = 5920
Step 75: 5920 + 80 = 6000
Step 76: 6000 + 80 = 6080
Step 77: 6080 + 80 = 6160
Step 78: 6160 + 80 = 6240
Step 79: 6240 + 80 = 6320
Step 80: 6320 + 80 = 6400
Step 81: 6400 + 80 = 6480
Step 82: 6480 + 80 = 6560
Step 83: 6560 + 80 = 6640
Step 84: 6640 + 80 = 6720
Step 85: 6720 + 80 = 6800
Step 86: 6800 + 80 = 6880
Step 87: 6880 + 80 = 6960
Step 88: 6960 + 80 = 7040
Step 89: 7040 + 80 = 7120
Step 90: 7120 + 80 = 7200
Step 91: 7200 + 80 = 7280
Step 92: 7280 + 80 = 7360
Step 93: 7360 + 80 = 7440
Step 94: 7440 + 80 = 7520
Step 95: 7520 + 80 = 7600
Step 96: 7600 + 80 = 7680
Step 97: 7680 + 80 = 7760
Step 98: 7760 + 80 = 7840
Step 99: 7840 + 80 = 7920
Step 100: 7920 + 80 = 8000
Step 101: 8000 + 80 = 8080
Step 102: 8080 + 80 = 8160
Step 103: 8160 + 80 = 8240
Step 104: 8240 + 80 = 8320
Step 105: 8320 + 80 = 8400
Step 106: 8400 + 80 = 8480
Step 107: 8480 + 80 = 8560
Step 108: 8560 + 80 = 8640
Step 109: 8640 + 80 = 8720
Step 110: 8720 + 80 = 8800
Step 111: 8800 + 80 = 8880
Step 112: 8880 + 80 = 8960
Step 113: 8960 + 80 = 9040
Step 114: 9040 + 80 = 9120
Step 115: 9120 + 80 = 9200
Step 116: 9200 + 80 = 9280
Step 117: 9280 + 80 = 9360
Step 118: 9360 + 80 = 9440
Step 119: 9440 + 80 = 9520
Step 120: 9520 + 80 = 9600
Step 121: 9600 + 80 = 9680
Step 122: 9680 + 80 = 9760
Step 123: 9760 + 80 = 9840
Step 124: 9840 + 80 = 9920
Step 125: 9920 + 80 = 10000
Step 126: 10000 + 80 = 10080
Step 127: 10080 + 80 = 10160
Step 128: 10160 + 80 = 10240
Step 129: 10240 + 80 = 10320
Step 130: 10320 + 80 = 10400
Step 131: 10400 + 80 = 10480
Step 132: 10480 + 80 = 10560
Step 133: 10560 + 80 = 10640
Step 134: 10640 + 80 = 10720
Step 135: 10720 + 80 = 10800
Step 136: 10800 + 80 = 10880
Step 137: 10880 + 80 = 10960
Step 138: 10960 + 80 = 11040
Step 139: 11040 + 80 = 11120
Step 140: 11120 + 80 = 11200
Step 141: 11200 + 80 = 11280
Step 142: 11280 + 80 = 11360
Step 143: 11360 + 80 = 11440
Step 144: 11440 + 80 = 11520
Step 145: 11520 + 80 = 11600
Step 146: 11600 + 80 = 11680
Step 147: 11680 + 80 = 11760
Step 148: 11760 + 80 = 11840
Step 149: 11840 + 80 = 11920
Step 150: 11920 + 80 = 12000
Step 151: 12000 + 80 = 12080
Step 152: 12080 + 80 = 12160
Step 153: 12160 + 80 = 12240
Step 154: 12240 + 80 = 12320
Step 155: 12320 + 80 = 12400
Step 156: 12400 + 80 = 12480
Step 157: 12480 + 80 = 12560
Step 158: 12560 + 80 = 12640
Step 159: 12640 + 80 = 12720
Step 160: 12720 + 80 = 12800
Step 161: 12800 + 80 = 12880
Step 162: 12880 + 80 = 12960
Step 163: 12960 + 80 = 13040
Step 164: 13040 + 80 = 13120
Step 165: 13120 + 80 = 13200
Step 166: 13200 + 80 = 13280
Step 167: 13280 + 80 = 13360
Step 168: 13360 + 80 = 13440

So, 80*168 = 13440