OK, let's work through this together. We're starting with 800 and we're going to multiply it by 166, which means we add 800 to itself 166 times.
Step 1: 0 + 800 = 800
Step 2: 800 + 800 = 1600
Step 3: 1600 + 800 = 2400
Step 4: 2400 + 800 = 3200
Step 5: 3200 + 800 = 4000
Step 6: 4000 + 800 = 4800
Step 7: 4800 + 800 = 5600
Step 8: 5600 + 800 = 6400
Step 9: 6400 + 800 = 7200
Step 10: 7200 + 800 = 8000
Step 11: 8000 + 800 = 8800
Step 12: 8800 + 800 = 9600
Step 13: 9600 + 800 = 10400
Step 14: 10400 + 800 = 11200
Step 15: 11200 + 800 = 12000
Step 16: 12000 + 800 = 12800
Step 17: 12800 + 800 = 13600
Step 18: 13600 + 800 = 14400
Step 19: 14400 + 800 = 15200
Step 20: 15200 + 800 = 16000
Step 21: 16000 + 800 = 16800
Step 22: 16800 + 800 = 17600
Step 23: 17600 + 800 = 18400
Step 24: 18400 + 800 = 19200
Step 25: 19200 + 800 = 20000
Step 26: 20000 + 800 = 20800
Step 27: 20800 + 800 = 21600
Step 28: 21600 + 800 = 22400
Step 29: 22400 + 800 = 23200
Step 30: 23200 + 800 = 24000
Step 31: 24000 + 800 = 24800
Step 32: 24800 + 800 = 25600
Step 33: 25600 + 800 = 26400
Step 34: 26400 + 800 = 27200
Step 35: 27200 + 800 = 28000
Step 36: 28000 + 800 = 28800
Step 37: 28800 + 800 = 29600
Step 38: 29600 + 800 = 30400
Step 39: 30400 + 800 = 31200
Step 40: 31200 + 800 = 32000
Step 41: 32000 + 800 = 32800
Step 42: 32800 + 800 = 33600
Step 43: 33600 + 800 = 34400
Step 44: 34400 + 800 = 35200
Step 45: 35200 + 800 = 36000
Step 46: 36000 + 800 = 36800
Step 47: 36800 + 800 = 37600
Step 48: 37600 + 800 = 38400
Step 49: 38400 + 800 = 39200
Step 50: 39200 + 800 = 40000
Step 51: 40000 + 800 = 40800
Step 52: 40800 + 800 = 41600
Step 53: 41600 + 800 = 42400
Step 54: 42400 + 800 = 43200
Step 55: 43200 + 800 = 44000
Step 56: 44000 + 800 = 44800
Step 57: 44800 + 800 = 45600
Step 58: 45600 + 800 = 46400
Step 59: 46400 + 800 = 47200
Step 60: 47200 + 800 = 48000
Step 61: 48000 + 800 = 48800
Step 62: 48800 + 800 = 49600
Step 63: 49600 + 800 = 50400
Step 64: 50400 + 800 = 51200
Step 65: 51200 + 800 = 52000
Step 66: 52000 + 800 = 52800
Step 67: 52800 + 800 = 53600
Step 68: 53600 + 800 = 54400
Step 69: 54400 + 800 = 55200
Step 70: 55200 + 800 = 56000
Step 71: 56000 + 800 = 56800
Step 72: 56800 + 800 = 57600
Step 73: 57600 + 800 = 58400
Step 74: 58400 + 800 = 59200
Step 75: 59200 + 800 = 60000
Step 76: 60000 + 800 = 60800
Step 77: 60800 + 800 = 61600
Step 78: 61600 + 800 = 62400
Step 79: 62400 + 800 = 63200
Step 80: 63200 + 800 = 64000
Step 81: 64000 + 800 = 64800
Step 82: 64800 + 800 = 65600
Step 83: 65600 + 800 = 66400
Step 84: 66400 + 800 = 67200
Step 85: 67200 + 800 = 68000
Step 86: 68000 + 800 = 68800
Step 87: 68800 + 800 = 69600
Step 88: 69600 + 800 = 70400
Step 89: 70400 + 800 = 71200
Step 90: 71200 + 800 = 72000
Step 91: 72000 + 800 = 72800
Step 92: 72800 + 800 = 73600
Step 93: 73600 + 800 = 74400
Step 94: 74400 + 800 = 75200
Step 95: 75200 + 800 = 76000
Step 96: 76000 + 800 = 76800
Step 97: 76800 + 800 = 77600
Step 98: 77600 + 800 = 78400
Step 99: 78400 + 800 = 79200
Step 100: 79200 + 800 = 80000
Step 101: 80000 + 800 = 80800
Step 102: 80800 + 800 = 81600
Step 103: 81600 + 800 = 82400
Step 104: 82400 + 800 = 83200
Step 105: 83200 + 800 = 84000
Step 106: 84000 + 800 = 84800
Step 107: 84800 + 800 = 85600
Step 108: 85600 + 800 = 86400
Step 109: 86400 + 800 = 87200
Step 110: 87200 + 800 = 88000
Step 111: 88000 + 800 = 88800
Step 112: 88800 + 800 = 89600
Step 113: 89600 + 800 = 90400
Step 114: 90400 + 800 = 91200
Step 115: 91200 + 800 = 92000
Step 116: 92000 + 800 = 92800
Step 117: 92800 + 800 = 93600
Step 118: 93600 + 800 = 94400
Step 119: 94400 + 800 = 95200
Step 120: 95200 + 800 = 96000
Step 121: 96000 + 800 = 96800
Step 122: 96800 + 800 = 97600
Step 123: 97600 + 800 = 98400
Step 124: 98400 + 800 = 99200
Step 125: 99200 + 800 = 100000
Step 126: 100000 + 800 = 100800
Step 127: 100800 + 800 = 101600
Step 128: 101600 + 800 = 102400
Step 129: 102400 + 800 = 103200
Step 130: 103200 + 800 = 104000
Step 131: 104000 + 800 = 104800
Step 132: 104800 + 800 = 105600
Step 133: 105600 + 800 = 106400
Step 134: 106400 + 800 = 107200
Step 135: 107200 + 800 = 108000
Step 136: 108000 + 800 = 108800
Step 137: 108800 + 800 = 109600
Step 138: 109600 + 800 = 110400
Step 139: 110400 + 800 = 111200
Step 140: 111200 + 800 = 112000
Step 141: 112000 + 800 = 112800
Step 142: 112800 + 800 = 113600
Step 143: 113600 + 800 = 114400
Step 144: 114400 + 800 = 115200
Step 145: 115200 + 800 = 116000
Step 146: 116000 + 800 = 116800
Step 147: 116800 + 800 = 117600
Step 148: 117600 + 800 = 118400
Step 149: 118400 + 800 = 119200
Step 150: 119200 + 800 = 120000
Step 151: 120000 + 800 = 120800
Step 152: 120800 + 800 = 121600
Step 153: 121600 + 800 = 122400
Step 154: 122400 + 800 = 123200
Step 155: 123200 + 800 = 124000
Step 156: 124000 + 800 = 124800
Step 157: 124800 + 800 = 125600
Step 158: 125600 + 800 = 126400
Step 159: 126400 + 800 = 127200
Step 160: 127200 + 800 = 128000
Step 161: 128000 + 800 = 128800
Step 162: 128800 + 800 = 129600
Step 163: 129600 + 800 = 130400
Step 164: 130400 + 800 = 131200
Step 165: 131200 + 800 = 132000
Step 166: 132000 + 800 = 132800

So, 800*166 = 132800