Let's get this math done. We have 49 and we're going to multiply it by 210. This is the same as taking 49 and adding it to itself 210 times.
Step 1: 0 + 49 = 49
Step 2: 49 + 49 = 98
Step 3: 98 + 49 = 147
Step 4: 147 + 49 = 196
Step 5: 196 + 49 = 245
Step 6: 245 + 49 = 294
Step 7: 294 + 49 = 343
Step 8: 343 + 49 = 392
Step 9: 392 + 49 = 441
Step 10: 441 + 49 = 490
Step 11: 490 + 49 = 539
Step 12: 539 + 49 = 588
Step 13: 588 + 49 = 637
Step 14: 637 + 49 = 686
Step 15: 686 + 49 = 735
Step 16: 735 + 49 = 784
Step 17: 784 + 49 = 833
Step 18: 833 + 49 = 882
Step 19: 882 + 49 = 931
Step 20: 931 + 49 = 980
Step 21: 980 + 49 = 1029
Step 22: 1029 + 49 = 1078
Step 23: 1078 + 49 = 1127
Step 24: 1127 + 49 = 1176
Step 25: 1176 + 49 = 1225
Step 26: 1225 + 49 = 1274
Step 27: 1274 + 49 = 1323
Step 28: 1323 + 49 = 1372
Step 29: 1372 + 49 = 1421
Step 30: 1421 + 49 = 1470
Step 31: 1470 + 49 = 1519
Step 32: 1519 + 49 = 1568
Step 33: 1568 + 49 = 1617
Step 34: 1617 + 49 = 1666
Step 35: 1666 + 49 = 1715
Step 36: 1715 + 49 = 1764
Step 37: 1764 + 49 = 1813
Step 38: 1813 + 49 = 1862
Step 39: 1862 + 49 = 1911
Step 40: 1911 + 49 = 1960
Step 41: 1960 + 49 = 2009
Step 42: 2009 + 49 = 2058
Step 43: 2058 + 49 = 2107
Step 44: 2107 + 49 = 2156
Step 45: 2156 + 49 = 2205
Step 46: 2205 + 49 = 2254
Step 47: 2254 + 49 = 2303
Step 48: 2303 + 49 = 2352
Step 49: 2352 + 49 = 2401
Step 50: 2401 + 49 = 2450
Step 51: 2450 + 49 = 2499
Step 52: 2499 + 49 = 2548
Step 53: 2548 + 49 = 2597
Step 54: 2597 + 49 = 2646
Step 55: 2646 + 49 = 2695
Step 56: 2695 + 49 = 2744
Step 57: 2744 + 49 = 2793
Step 58: 2793 + 49 = 2842
Step 59: 2842 + 49 = 2891
Step 60: 2891 + 49 = 2940
Step 61: 2940 + 49 = 2989
Step 62: 2989 + 49 = 3038
Step 63: 3038 + 49 = 3087
Step 64: 3087 + 49 = 3136
Step 65: 3136 + 49 = 3185
Step 66: 3185 + 49 = 3234
Step 67: 3234 + 49 = 3283
Step 68: 3283 + 49 = 3332
Step 69: 3332 + 49 = 3381
Step 70: 3381 + 49 = 3430
Step 71: 3430 + 49 = 3479
Step 72: 3479 + 49 = 3528
Step 73: 3528 + 49 = 3577
Step 74: 3577 + 49 = 3626
Step 75: 3626 + 49 = 3675
Step 76: 3675 + 49 = 3724
Step 77: 3724 + 49 = 3773
Step 78: 3773 + 49 = 3822
Step 79: 3822 + 49 = 3871
Step 80: 3871 + 49 = 3920
Step 81: 3920 + 49 = 3969
Step 82: 3969 + 49 = 4018
Step 83: 4018 + 49 = 4067
Step 84: 4067 + 49 = 4116
Step 85: 4116 + 49 = 4165
Step 86: 4165 + 49 = 4214
Step 87: 4214 + 49 = 4263
Step 88: 4263 + 49 = 4312
Step 89: 4312 + 49 = 4361
Step 90: 4361 + 49 = 4410
Step 91: 4410 + 49 = 4459
Step 92: 4459 + 49 = 4508
Step 93: 4508 + 49 = 4557
Step 94: 4557 + 49 = 4606
Step 95: 4606 + 49 = 4655
Step 96: 4655 + 49 = 4704
Step 97: 4704 + 49 = 4753
Step 98: 4753 + 49 = 4802
Step 99: 4802 + 49 = 4851
Step 100: 4851 + 49 = 4900
Step 101: 4900 + 49 = 4949
Step 102: 4949 + 49 = 4998
Step 103: 4998 + 49 = 5047
Step 104: 5047 + 49 = 5096
Step 105: 5096 + 49 = 5145
Step 106: 5145 + 49 = 5194
Step 107: 5194 + 49 = 5243
Step 108: 5243 + 49 = 5292
Step 109: 5292 + 49 = 5341
Step 110: 5341 + 49 = 5390
Step 111: 5390 + 49 = 5439
Step 112: 5439 + 49 = 5488
Step 113: 5488 + 49 = 5537
Step 114: 5537 + 49 = 5586
Step 115: 5586 + 49 = 5635
Step 116: 5635 + 49 = 5684
Step 117: 5684 + 49 = 5733
Step 118: 5733 + 49 = 5782
Step 119: 5782 + 49 = 5831
Step 120: 5831 + 49 = 5880
Step 121: 5880 + 49 = 5929
Step 122: 5929 + 49 = 5978
Step 123: 5978 + 49 = 6027
Step 124: 6027 + 49 = 6076
Step 125: 6076 + 49 = 6125
Step 126: 6125 + 49 = 6174
Step 127: 6174 + 49 = 6223
Step 128: 6223 + 49 = 6272
Step 129: 6272 + 49 = 6321
Step 130: 6321 + 49 = 6370
Step 131: 6370 + 49 = 6419
Step 132: 6419 + 49 = 6468
Step 133: 6468 + 49 = 6517
Step 134: 6517 + 49 = 6566
Step 135: 6566 + 49 = 6615
Step 136: 6615 + 49 = 6664
Step 137: 6664 + 49 = 6713
Step 138: 6713 + 49 = 6762
Step 139: 6762 + 49 = 6811
Step 140: 6811 + 49 = 6860
Step 141: 6860 + 49 = 6909
Step 142: 6909 + 49 = 6958
Step 143: 6958 + 49 = 7007
Step 144: 7007 + 49 = 7056
Step 145: 7056 + 49 = 7105
Step 146: 7105 + 49 = 7154
Step 147: 7154 + 49 = 7203
Step 148: 7203 + 49 = 7252
Step 149: 7252 + 49 = 7301
Step 150: 7301 + 49 = 7350
Step 151: 7350 + 49 = 7399
Step 152: 7399 + 49 = 7448
Step 153: 7448 + 49 = 7497
Step 154: 7497 + 49 = 7546
Step 155: 7546 + 49 = 7595
Step 156: 7595 + 49 = 7644
Step 157: 7644 + 49 = 7693
Step 158: 7693 + 49 = 7742
Step 159: 7742 + 49 = 7791
Step 160: 7791 + 49 = 7840
Step 161: 7840 + 49 = 7889
Step 162: 7889 + 49 = 7938
Step 163: 7938 + 49 = 7987
Step 164: 7987 + 49 = 8036
Step 165: 8036 + 49 = 8085
Step 166: 8085 + 49 = 8134
Step 167: 8134 + 49 = 8183
Step 168: 8183 + 49 = 8232
Step 169: 8232 + 49 = 8281
Step 170: 8281 + 49 = 8330
Step 171: 8330 + 49 = 8379
Step 172: 8379 + 49 = 8428
Step 173: 8428 + 49 = 8477
Step 174: 8477 + 49 = 8526
Step 175: 8526 + 49 = 8575
Step 176: 8575 + 49 = 8624
Step 177: 8624 + 49 = 8673
Step 178: 8673 + 49 = 8722
Step 179: 8722 + 49 = 8771
Step 180: 8771 + 49 = 8820
Step 181: 8820 + 49 = 8869
Step 182: 8869 + 49 = 8918
Step 183: 8918 + 49 = 8967
Step 184: 8967 + 49 = 9016
Step 185: 9016 + 49 = 9065
Step 186: 9065 + 49 = 9114
Step 187: 9114 + 49 = 9163
Step 188: 9163 + 49 = 9212
Step 189: 9212 + 49 = 9261
Step 190: 9261 + 49 = 9310
Step 191: 9310 + 49 = 9359
Step 192: 9359 + 49 = 9408
Step 193: 9408 + 49 = 9457
Step 194: 9457 + 49 = 9506
Step 195: 9506 + 49 = 9555
Step 196: 9555 + 49 = 9604
Step 197: 9604 + 49 = 9653
Step 198: 9653 + 49 = 9702
Step 199: 9702 + 49 = 9751
Step 200: 9751 + 49 = 9800
Step 201: 9800 + 49 = 9849
Step 202: 9849 + 49 = 9898
Step 203: 9898 + 49 = 9947
Step 204: 9947 + 49 = 9996
Step 205: 9996 + 49 = 10045
Step 206: 10045 + 49 = 10094
Step 207: 10094 + 49 = 10143
Step 208: 10143 + 49 = 10192
Step 209: 10192 + 49 = 10241
Step 210: 10241 + 49 = 10290

So, 49*210 = 10290