Alright, let's solve this math problem step by step. First, we have the number 102. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 209. So, we're going to take the number 102 and add it to itself 209 times.
Step 1: 0 + 102 = 102
Step 2: 102 + 102 = 204
Step 3: 204 + 102 = 306
Step 4: 306 + 102 = 408
Step 5: 408 + 102 = 510
Step 6: 510 + 102 = 612
Step 7: 612 + 102 = 714
Step 8: 714 + 102 = 816
Step 9: 816 + 102 = 918
Step 10: 918 + 102 = 1020
Step 11: 1020 + 102 = 1122
Step 12: 1122 + 102 = 1224
Step 13: 1224 + 102 = 1326
Step 14: 1326 + 102 = 1428
Step 15: 1428 + 102 = 1530
Step 16: 1530 + 102 = 1632
Step 17: 1632 + 102 = 1734
Step 18: 1734 + 102 = 1836
Step 19: 1836 + 102 = 1938
Step 20: 1938 + 102 = 2040
Step 21: 2040 + 102 = 2142
Step 22: 2142 + 102 = 2244
Step 23: 2244 + 102 = 2346
Step 24: 2346 + 102 = 2448
Step 25: 2448 + 102 = 2550
Step 26: 2550 + 102 = 2652
Step 27: 2652 + 102 = 2754
Step 28: 2754 + 102 = 2856
Step 29: 2856 + 102 = 2958
Step 30: 2958 + 102 = 3060
Step 31: 3060 + 102 = 3162
Step 32: 3162 + 102 = 3264
Step 33: 3264 + 102 = 3366
Step 34: 3366 + 102 = 3468
Step 35: 3468 + 102 = 3570
Step 36: 3570 + 102 = 3672
Step 37: 3672 + 102 = 3774
Step 38: 3774 + 102 = 3876
Step 39: 3876 + 102 = 3978
Step 40: 3978 + 102 = 4080
Step 41: 4080 + 102 = 4182
Step 42: 4182 + 102 = 4284
Step 43: 4284 + 102 = 4386
Step 44: 4386 + 102 = 4488
Step 45: 4488 + 102 = 4590
Step 46: 4590 + 102 = 4692
Step 47: 4692 + 102 = 4794
Step 48: 4794 + 102 = 4896
Step 49: 4896 + 102 = 4998
Step 50: 4998 + 102 = 5100
Step 51: 5100 + 102 = 5202
Step 52: 5202 + 102 = 5304
Step 53: 5304 + 102 = 5406
Step 54: 5406 + 102 = 5508
Step 55: 5508 + 102 = 5610
Step 56: 5610 + 102 = 5712
Step 57: 5712 + 102 = 5814
Step 58: 5814 + 102 = 5916
Step 59: 5916 + 102 = 6018
Step 60: 6018 + 102 = 6120
Step 61: 6120 + 102 = 6222
Step 62: 6222 + 102 = 6324
Step 63: 6324 + 102 = 6426
Step 64: 6426 + 102 = 6528
Step 65: 6528 + 102 = 6630
Step 66: 6630 + 102 = 6732
Step 67: 6732 + 102 = 6834
Step 68: 6834 + 102 = 6936
Step 69: 6936 + 102 = 7038
Step 70: 7038 + 102 = 7140
Step 71: 7140 + 102 = 7242
Step 72: 7242 + 102 = 7344
Step 73: 7344 + 102 = 7446
Step 74: 7446 + 102 = 7548
Step 75: 7548 + 102 = 7650
Step 76: 7650 + 102 = 7752
Step 77: 7752 + 102 = 7854
Step 78: 7854 + 102 = 7956
Step 79: 7956 + 102 = 8058
Step 80: 8058 + 102 = 8160
Step 81: 8160 + 102 = 8262
Step 82: 8262 + 102 = 8364
Step 83: 8364 + 102 = 8466
Step 84: 8466 + 102 = 8568
Step 85: 8568 + 102 = 8670
Step 86: 8670 + 102 = 8772
Step 87: 8772 + 102 = 8874
Step 88: 8874 + 102 = 8976
Step 89: 8976 + 102 = 9078
Step 90: 9078 + 102 = 9180
Step 91: 9180 + 102 = 9282
Step 92: 9282 + 102 = 9384
Step 93: 9384 + 102 = 9486
Step 94: 9486 + 102 = 9588
Step 95: 9588 + 102 = 9690
Step 96: 9690 + 102 = 9792
Step 97: 9792 + 102 = 9894
Step 98: 9894 + 102 = 9996
Step 99: 9996 + 102 = 10098
Step 100: 10098 + 102 = 10200
Step 101: 10200 + 102 = 10302
Step 102: 10302 + 102 = 10404
Step 103: 10404 + 102 = 10506
Step 104: 10506 + 102 = 10608
Step 105: 10608 + 102 = 10710
Step 106: 10710 + 102 = 10812
Step 107: 10812 + 102 = 10914
Step 108: 10914 + 102 = 11016
Step 109: 11016 + 102 = 11118
Step 110: 11118 + 102 = 11220
Step 111: 11220 + 102 = 11322
Step 112: 11322 + 102 = 11424
Step 113: 11424 + 102 = 11526
Step 114: 11526 + 102 = 11628
Step 115: 11628 + 102 = 11730
Step 116: 11730 + 102 = 11832
Step 117: 11832 + 102 = 11934
Step 118: 11934 + 102 = 12036
Step 119: 12036 + 102 = 12138
Step 120: 12138 + 102 = 12240
Step 121: 12240 + 102 = 12342
Step 122: 12342 + 102 = 12444
Step 123: 12444 + 102 = 12546
Step 124: 12546 + 102 = 12648
Step 125: 12648 + 102 = 12750
Step 126: 12750 + 102 = 12852
Step 127: 12852 + 102 = 12954
Step 128: 12954 + 102 = 13056
Step 129: 13056 + 102 = 13158
Step 130: 13158 + 102 = 13260
Step 131: 13260 + 102 = 13362
Step 132: 13362 + 102 = 13464
Step 133: 13464 + 102 = 13566
Step 134: 13566 + 102 = 13668
Step 135: 13668 + 102 = 13770
Step 136: 13770 + 102 = 13872
Step 137: 13872 + 102 = 13974
Step 138: 13974 + 102 = 14076
Step 139: 14076 + 102 = 14178
Step 140: 14178 + 102 = 14280
Step 141: 14280 + 102 = 14382
Step 142: 14382 + 102 = 14484
Step 143: 14484 + 102 = 14586
Step 144: 14586 + 102 = 14688
Step 145: 14688 + 102 = 14790
Step 146: 14790 + 102 = 14892
Step 147: 14892 + 102 = 14994
Step 148: 14994 + 102 = 15096
Step 149: 15096 + 102 = 15198
Step 150: 15198 + 102 = 15300
Step 151: 15300 + 102 = 15402
Step 152: 15402 + 102 = 15504
Step 153: 15504 + 102 = 15606
Step 154: 15606 + 102 = 15708
Step 155: 15708 + 102 = 15810
Step 156: 15810 + 102 = 15912
Step 157: 15912 + 102 = 16014
Step 158: 16014 + 102 = 16116
Step 159: 16116 + 102 = 16218
Step 160: 16218 + 102 = 16320
Step 161: 16320 + 102 = 16422
Step 162: 16422 + 102 = 16524
Step 163: 16524 + 102 = 16626
Step 164: 16626 + 102 = 16728
Step 165: 16728 + 102 = 16830
Step 166: 16830 + 102 = 16932
Step 167: 16932 + 102 = 17034
Step 168: 17034 + 102 = 17136
Step 169: 17136 + 102 = 17238
Step 170: 17238 + 102 = 17340
Step 171: 17340 + 102 = 17442
Step 172: 17442 + 102 = 17544
Step 173: 17544 + 102 = 17646
Step 174: 17646 + 102 = 17748
Step 175: 17748 + 102 = 17850
Step 176: 17850 + 102 = 17952
Step 177: 17952 + 102 = 18054
Step 178: 18054 + 102 = 18156
Step 179: 18156 + 102 = 18258
Step 180: 18258 + 102 = 18360
Step 181: 18360 + 102 = 18462
Step 182: 18462 + 102 = 18564
Step 183: 18564 + 102 = 18666
Step 184: 18666 + 102 = 18768
Step 185: 18768 + 102 = 18870
Step 186: 18870 + 102 = 18972
Step 187: 18972 + 102 = 19074
Step 188: 19074 + 102 = 19176
Step 189: 19176 + 102 = 19278
Step 190: 19278 + 102 = 19380
Step 191: 19380 + 102 = 19482
Step 192: 19482 + 102 = 19584
Step 193: 19584 + 102 = 19686
Step 194: 19686 + 102 = 19788
Step 195: 19788 + 102 = 19890
Step 196: 19890 + 102 = 19992
Step 197: 19992 + 102 = 20094
Step 198: 20094 + 102 = 20196
Step 199: 20196 + 102 = 20298
Step 200: 20298 + 102 = 20400
Step 201: 20400 + 102 = 20502
Step 202: 20502 + 102 = 20604
Step 203: 20604 + 102 = 20706
Step 204: 20706 + 102 = 20808
Step 205: 20808 + 102 = 20910
Step 206: 20910 + 102 = 21012
Step 207: 21012 + 102 = 21114
Step 208: 21114 + 102 = 21216
Step 209: 21216 + 102 = 21318

So, 102*209 = 21318