Alright, let's solve this math problem step by step. First, we have the number 321. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 210. So, we're going to take the number 321 and add it to itself 210 times.
Step 1: 0 + 321 = 321
Step 2: 321 + 321 = 642
Step 3: 642 + 321 = 963
Step 4: 963 + 321 = 1284
Step 5: 1284 + 321 = 1605
Step 6: 1605 + 321 = 1926
Step 7: 1926 + 321 = 2247
Step 8: 2247 + 321 = 2568
Step 9: 2568 + 321 = 2889
Step 10: 2889 + 321 = 3210
Step 11: 3210 + 321 = 3531
Step 12: 3531 + 321 = 3852
Step 13: 3852 + 321 = 4173
Step 14: 4173 + 321 = 4494
Step 15: 4494 + 321 = 4815
Step 16: 4815 + 321 = 5136
Step 17: 5136 + 321 = 5457
Step 18: 5457 + 321 = 5778
Step 19: 5778 + 321 = 6099
Step 20: 6099 + 321 = 6420
Step 21: 6420 + 321 = 6741
Step 22: 6741 + 321 = 7062
Step 23: 7062 + 321 = 7383
Step 24: 7383 + 321 = 7704
Step 25: 7704 + 321 = 8025
Step 26: 8025 + 321 = 8346
Step 27: 8346 + 321 = 8667
Step 28: 8667 + 321 = 8988
Step 29: 8988 + 321 = 9309
Step 30: 9309 + 321 = 9630
Step 31: 9630 + 321 = 9951
Step 32: 9951 + 321 = 10272
Step 33: 10272 + 321 = 10593
Step 34: 10593 + 321 = 10914
Step 35: 10914 + 321 = 11235
Step 36: 11235 + 321 = 11556
Step 37: 11556 + 321 = 11877
Step 38: 11877 + 321 = 12198
Step 39: 12198 + 321 = 12519
Step 40: 12519 + 321 = 12840
Step 41: 12840 + 321 = 13161
Step 42: 13161 + 321 = 13482
Step 43: 13482 + 321 = 13803
Step 44: 13803 + 321 = 14124
Step 45: 14124 + 321 = 14445
Step 46: 14445 + 321 = 14766
Step 47: 14766 + 321 = 15087
Step 48: 15087 + 321 = 15408
Step 49: 15408 + 321 = 15729
Step 50: 15729 + 321 = 16050
Step 51: 16050 + 321 = 16371
Step 52: 16371 + 321 = 16692
Step 53: 16692 + 321 = 17013
Step 54: 17013 + 321 = 17334
Step 55: 17334 + 321 = 17655
Step 56: 17655 + 321 = 17976
Step 57: 17976 + 321 = 18297
Step 58: 18297 + 321 = 18618
Step 59: 18618 + 321 = 18939
Step 60: 18939 + 321 = 19260
Step 61: 19260 + 321 = 19581
Step 62: 19581 + 321 = 19902
Step 63: 19902 + 321 = 20223
Step 64: 20223 + 321 = 20544
Step 65: 20544 + 321 = 20865
Step 66: 20865 + 321 = 21186
Step 67: 21186 + 321 = 21507
Step 68: 21507 + 321 = 21828
Step 69: 21828 + 321 = 22149
Step 70: 22149 + 321 = 22470
Step 71: 22470 + 321 = 22791
Step 72: 22791 + 321 = 23112
Step 73: 23112 + 321 = 23433
Step 74: 23433 + 321 = 23754
Step 75: 23754 + 321 = 24075
Step 76: 24075 + 321 = 24396
Step 77: 24396 + 321 = 24717
Step 78: 24717 + 321 = 25038
Step 79: 25038 + 321 = 25359
Step 80: 25359 + 321 = 25680
Step 81: 25680 + 321 = 26001
Step 82: 26001 + 321 = 26322
Step 83: 26322 + 321 = 26643
Step 84: 26643 + 321 = 26964
Step 85: 26964 + 321 = 27285
Step 86: 27285 + 321 = 27606
Step 87: 27606 + 321 = 27927
Step 88: 27927 + 321 = 28248
Step 89: 28248 + 321 = 28569
Step 90: 28569 + 321 = 28890
Step 91: 28890 + 321 = 29211
Step 92: 29211 + 321 = 29532
Step 93: 29532 + 321 = 29853
Step 94: 29853 + 321 = 30174
Step 95: 30174 + 321 = 30495
Step 96: 30495 + 321 = 30816
Step 97: 30816 + 321 = 31137
Step 98: 31137 + 321 = 31458
Step 99: 31458 + 321 = 31779
Step 100: 31779 + 321 = 32100
Step 101: 32100 + 321 = 32421
Step 102: 32421 + 321 = 32742
Step 103: 32742 + 321 = 33063
Step 104: 33063 + 321 = 33384
Step 105: 33384 + 321 = 33705
Step 106: 33705 + 321 = 34026
Step 107: 34026 + 321 = 34347
Step 108: 34347 + 321 = 34668
Step 109: 34668 + 321 = 34989
Step 110: 34989 + 321 = 35310
Step 111: 35310 + 321 = 35631
Step 112: 35631 + 321 = 35952
Step 113: 35952 + 321 = 36273
Step 114: 36273 + 321 = 36594
Step 115: 36594 + 321 = 36915
Step 116: 36915 + 321 = 37236
Step 117: 37236 + 321 = 37557
Step 118: 37557 + 321 = 37878
Step 119: 37878 + 321 = 38199
Step 120: 38199 + 321 = 38520
Step 121: 38520 + 321 = 38841
Step 122: 38841 + 321 = 39162
Step 123: 39162 + 321 = 39483
Step 124: 39483 + 321 = 39804
Step 125: 39804 + 321 = 40125
Step 126: 40125 + 321 = 40446
Step 127: 40446 + 321 = 40767
Step 128: 40767 + 321 = 41088
Step 129: 41088 + 321 = 41409
Step 130: 41409 + 321 = 41730
Step 131: 41730 + 321 = 42051
Step 132: 42051 + 321 = 42372
Step 133: 42372 + 321 = 42693
Step 134: 42693 + 321 = 43014
Step 135: 43014 + 321 = 43335
Step 136: 43335 + 321 = 43656
Step 137: 43656 + 321 = 43977
Step 138: 43977 + 321 = 44298
Step 139: 44298 + 321 = 44619
Step 140: 44619 + 321 = 44940
Step 141: 44940 + 321 = 45261
Step 142: 45261 + 321 = 45582
Step 143: 45582 + 321 = 45903
Step 144: 45903 + 321 = 46224
Step 145: 46224 + 321 = 46545
Step 146: 46545 + 321 = 46866
Step 147: 46866 + 321 = 47187
Step 148: 47187 + 321 = 47508
Step 149: 47508 + 321 = 47829
Step 150: 47829 + 321 = 48150
Step 151: 48150 + 321 = 48471
Step 152: 48471 + 321 = 48792
Step 153: 48792 + 321 = 49113
Step 154: 49113 + 321 = 49434
Step 155: 49434 + 321 = 49755
Step 156: 49755 + 321 = 50076
Step 157: 50076 + 321 = 50397
Step 158: 50397 + 321 = 50718
Step 159: 50718 + 321 = 51039
Step 160: 51039 + 321 = 51360
Step 161: 51360 + 321 = 51681
Step 162: 51681 + 321 = 52002
Step 163: 52002 + 321 = 52323
Step 164: 52323 + 321 = 52644
Step 165: 52644 + 321 = 52965
Step 166: 52965 + 321 = 53286
Step 167: 53286 + 321 = 53607
Step 168: 53607 + 321 = 53928
Step 169: 53928 + 321 = 54249
Step 170: 54249 + 321 = 54570
Step 171: 54570 + 321 = 54891
Step 172: 54891 + 321 = 55212
Step 173: 55212 + 321 = 55533
Step 174: 55533 + 321 = 55854
Step 175: 55854 + 321 = 56175
Step 176: 56175 + 321 = 56496
Step 177: 56496 + 321 = 56817
Step 178: 56817 + 321 = 57138
Step 179: 57138 + 321 = 57459
Step 180: 57459 + 321 = 57780
Step 181: 57780 + 321 = 58101
Step 182: 58101 + 321 = 58422
Step 183: 58422 + 321 = 58743
Step 184: 58743 + 321 = 59064
Step 185: 59064 + 321 = 59385
Step 186: 59385 + 321 = 59706
Step 187: 59706 + 321 = 60027
Step 188: 60027 + 321 = 60348
Step 189: 60348 + 321 = 60669
Step 190: 60669 + 321 = 60990
Step 191: 60990 + 321 = 61311
Step 192: 61311 + 321 = 61632
Step 193: 61632 + 321 = 61953
Step 194: 61953 + 321 = 62274
Step 195: 62274 + 321 = 62595
Step 196: 62595 + 321 = 62916
Step 197: 62916 + 321 = 63237
Step 198: 63237 + 321 = 63558
Step 199: 63558 + 321 = 63879
Step 200: 63879 + 321 = 64200
Step 201: 64200 + 321 = 64521
Step 202: 64521 + 321 = 64842
Step 203: 64842 + 321 = 65163
Step 204: 65163 + 321 = 65484
Step 205: 65484 + 321 = 65805
Step 206: 65805 + 321 = 66126
Step 207: 66126 + 321 = 66447
Step 208: 66447 + 321 = 66768
Step 209: 66768 + 321 = 67089
Step 210: 67089 + 321 = 67410

So, 321*210 = 67410