Let's roll up our sleeves and solve this. We have 768 and we're going to multiply it by 210, essentially adding 768 to itself 210 times.
Step 1: 0 + 768 = 768
Step 2: 768 + 768 = 1536
Step 3: 1536 + 768 = 2304
Step 4: 2304 + 768 = 3072
Step 5: 3072 + 768 = 3840
Step 6: 3840 + 768 = 4608
Step 7: 4608 + 768 = 5376
Step 8: 5376 + 768 = 6144
Step 9: 6144 + 768 = 6912
Step 10: 6912 + 768 = 7680
Step 11: 7680 + 768 = 8448
Step 12: 8448 + 768 = 9216
Step 13: 9216 + 768 = 9984
Step 14: 9984 + 768 = 10752
Step 15: 10752 + 768 = 11520
Step 16: 11520 + 768 = 12288
Step 17: 12288 + 768 = 13056
Step 18: 13056 + 768 = 13824
Step 19: 13824 + 768 = 14592
Step 20: 14592 + 768 = 15360
Step 21: 15360 + 768 = 16128
Step 22: 16128 + 768 = 16896
Step 23: 16896 + 768 = 17664
Step 24: 17664 + 768 = 18432
Step 25: 18432 + 768 = 19200
Step 26: 19200 + 768 = 19968
Step 27: 19968 + 768 = 20736
Step 28: 20736 + 768 = 21504
Step 29: 21504 + 768 = 22272
Step 30: 22272 + 768 = 23040
Step 31: 23040 + 768 = 23808
Step 32: 23808 + 768 = 24576
Step 33: 24576 + 768 = 25344
Step 34: 25344 + 768 = 26112
Step 35: 26112 + 768 = 26880
Step 36: 26880 + 768 = 27648
Step 37: 27648 + 768 = 28416
Step 38: 28416 + 768 = 29184
Step 39: 29184 + 768 = 29952
Step 40: 29952 + 768 = 30720
Step 41: 30720 + 768 = 31488
Step 42: 31488 + 768 = 32256
Step 43: 32256 + 768 = 33024
Step 44: 33024 + 768 = 33792
Step 45: 33792 + 768 = 34560
Step 46: 34560 + 768 = 35328
Step 47: 35328 + 768 = 36096
Step 48: 36096 + 768 = 36864
Step 49: 36864 + 768 = 37632
Step 50: 37632 + 768 = 38400
Step 51: 38400 + 768 = 39168
Step 52: 39168 + 768 = 39936
Step 53: 39936 + 768 = 40704
Step 54: 40704 + 768 = 41472
Step 55: 41472 + 768 = 42240
Step 56: 42240 + 768 = 43008
Step 57: 43008 + 768 = 43776
Step 58: 43776 + 768 = 44544
Step 59: 44544 + 768 = 45312
Step 60: 45312 + 768 = 46080
Step 61: 46080 + 768 = 46848
Step 62: 46848 + 768 = 47616
Step 63: 47616 + 768 = 48384
Step 64: 48384 + 768 = 49152
Step 65: 49152 + 768 = 49920
Step 66: 49920 + 768 = 50688
Step 67: 50688 + 768 = 51456
Step 68: 51456 + 768 = 52224
Step 69: 52224 + 768 = 52992
Step 70: 52992 + 768 = 53760
Step 71: 53760 + 768 = 54528
Step 72: 54528 + 768 = 55296
Step 73: 55296 + 768 = 56064
Step 74: 56064 + 768 = 56832
Step 75: 56832 + 768 = 57600
Step 76: 57600 + 768 = 58368
Step 77: 58368 + 768 = 59136
Step 78: 59136 + 768 = 59904
Step 79: 59904 + 768 = 60672
Step 80: 60672 + 768 = 61440
Step 81: 61440 + 768 = 62208
Step 82: 62208 + 768 = 62976
Step 83: 62976 + 768 = 63744
Step 84: 63744 + 768 = 64512
Step 85: 64512 + 768 = 65280
Step 86: 65280 + 768 = 66048
Step 87: 66048 + 768 = 66816
Step 88: 66816 + 768 = 67584
Step 89: 67584 + 768 = 68352
Step 90: 68352 + 768 = 69120
Step 91: 69120 + 768 = 69888
Step 92: 69888 + 768 = 70656
Step 93: 70656 + 768 = 71424
Step 94: 71424 + 768 = 72192
Step 95: 72192 + 768 = 72960
Step 96: 72960 + 768 = 73728
Step 97: 73728 + 768 = 74496
Step 98: 74496 + 768 = 75264
Step 99: 75264 + 768 = 76032
Step 100: 76032 + 768 = 76800
Step 101: 76800 + 768 = 77568
Step 102: 77568 + 768 = 78336
Step 103: 78336 + 768 = 79104
Step 104: 79104 + 768 = 79872
Step 105: 79872 + 768 = 80640
Step 106: 80640 + 768 = 81408
Step 107: 81408 + 768 = 82176
Step 108: 82176 + 768 = 82944
Step 109: 82944 + 768 = 83712
Step 110: 83712 + 768 = 84480
Step 111: 84480 + 768 = 85248
Step 112: 85248 + 768 = 86016
Step 113: 86016 + 768 = 86784
Step 114: 86784 + 768 = 87552
Step 115: 87552 + 768 = 88320
Step 116: 88320 + 768 = 89088
Step 117: 89088 + 768 = 89856
Step 118: 89856 + 768 = 90624
Step 119: 90624 + 768 = 91392
Step 120: 91392 + 768 = 92160
Step 121: 92160 + 768 = 92928
Step 122: 92928 + 768 = 93696
Step 123: 93696 + 768 = 94464
Step 124: 94464 + 768 = 95232
Step 125: 95232 + 768 = 96000
Step 126: 96000 + 768 = 96768
Step 127: 96768 + 768 = 97536
Step 128: 97536 + 768 = 98304
Step 129: 98304 + 768 = 99072
Step 130: 99072 + 768 = 99840
Step 131: 99840 + 768 = 100608
Step 132: 100608 + 768 = 101376
Step 133: 101376 + 768 = 102144
Step 134: 102144 + 768 = 102912
Step 135: 102912 + 768 = 103680
Step 136: 103680 + 768 = 104448
Step 137: 104448 + 768 = 105216
Step 138: 105216 + 768 = 105984
Step 139: 105984 + 768 = 106752
Step 140: 106752 + 768 = 107520
Step 141: 107520 + 768 = 108288
Step 142: 108288 + 768 = 109056
Step 143: 109056 + 768 = 109824
Step 144: 109824 + 768 = 110592
Step 145: 110592 + 768 = 111360
Step 146: 111360 + 768 = 112128
Step 147: 112128 + 768 = 112896
Step 148: 112896 + 768 = 113664
Step 149: 113664 + 768 = 114432
Step 150: 114432 + 768 = 115200
Step 151: 115200 + 768 = 115968
Step 152: 115968 + 768 = 116736
Step 153: 116736 + 768 = 117504
Step 154: 117504 + 768 = 118272
Step 155: 118272 + 768 = 119040
Step 156: 119040 + 768 = 119808
Step 157: 119808 + 768 = 120576
Step 158: 120576 + 768 = 121344
Step 159: 121344 + 768 = 122112
Step 160: 122112 + 768 = 122880
Step 161: 122880 + 768 = 123648
Step 162: 123648 + 768 = 124416
Step 163: 124416 + 768 = 125184
Step 164: 125184 + 768 = 125952
Step 165: 125952 + 768 = 126720
Step 166: 126720 + 768 = 127488
Step 167: 127488 + 768 = 128256
Step 168: 128256 + 768 = 129024
Step 169: 129024 + 768 = 129792
Step 170: 129792 + 768 = 130560
Step 171: 130560 + 768 = 131328
Step 172: 131328 + 768 = 132096
Step 173: 132096 + 768 = 132864
Step 174: 132864 + 768 = 133632
Step 175: 133632 + 768 = 134400
Step 176: 134400 + 768 = 135168
Step 177: 135168 + 768 = 135936
Step 178: 135936 + 768 = 136704
Step 179: 136704 + 768 = 137472
Step 180: 137472 + 768 = 138240
Step 181: 138240 + 768 = 139008
Step 182: 139008 + 768 = 139776
Step 183: 139776 + 768 = 140544
Step 184: 140544 + 768 = 141312
Step 185: 141312 + 768 = 142080
Step 186: 142080 + 768 = 142848
Step 187: 142848 + 768 = 143616
Step 188: 143616 + 768 = 144384
Step 189: 144384 + 768 = 145152
Step 190: 145152 + 768 = 145920
Step 191: 145920 + 768 = 146688
Step 192: 146688 + 768 = 147456
Step 193: 147456 + 768 = 148224
Step 194: 148224 + 768 = 148992
Step 195: 148992 + 768 = 149760
Step 196: 149760 + 768 = 150528
Step 197: 150528 + 768 = 151296
Step 198: 151296 + 768 = 152064
Step 199: 152064 + 768 = 152832
Step 200: 152832 + 768 = 153600
Step 201: 153600 + 768 = 154368
Step 202: 154368 + 768 = 155136
Step 203: 155136 + 768 = 155904
Step 204: 155904 + 768 = 156672
Step 205: 156672 + 768 = 157440
Step 206: 157440 + 768 = 158208
Step 207: 158208 + 768 = 158976
Step 208: 158976 + 768 = 159744
Step 209: 159744 + 768 = 160512
Step 210: 160512 + 768 = 161280

So, 768*210 = 161280