OK, let's work through this together. We're starting with 31 and we're going to multiply it by 223, which means we add 31 to itself 223 times.
Step 1: 0 + 31 = 31
Step 2: 31 + 31 = 62
Step 3: 62 + 31 = 93
Step 4: 93 + 31 = 124
Step 5: 124 + 31 = 155
Step 6: 155 + 31 = 186
Step 7: 186 + 31 = 217
Step 8: 217 + 31 = 248
Step 9: 248 + 31 = 279
Step 10: 279 + 31 = 310
Step 11: 310 + 31 = 341
Step 12: 341 + 31 = 372
Step 13: 372 + 31 = 403
Step 14: 403 + 31 = 434
Step 15: 434 + 31 = 465
Step 16: 465 + 31 = 496
Step 17: 496 + 31 = 527
Step 18: 527 + 31 = 558
Step 19: 558 + 31 = 589
Step 20: 589 + 31 = 620
Step 21: 620 + 31 = 651
Step 22: 651 + 31 = 682
Step 23: 682 + 31 = 713
Step 24: 713 + 31 = 744
Step 25: 744 + 31 = 775
Step 26: 775 + 31 = 806
Step 27: 806 + 31 = 837
Step 28: 837 + 31 = 868
Step 29: 868 + 31 = 899
Step 30: 899 + 31 = 930
Step 31: 930 + 31 = 961
Step 32: 961 + 31 = 992
Step 33: 992 + 31 = 1023
Step 34: 1023 + 31 = 1054
Step 35: 1054 + 31 = 1085
Step 36: 1085 + 31 = 1116
Step 37: 1116 + 31 = 1147
Step 38: 1147 + 31 = 1178
Step 39: 1178 + 31 = 1209
Step 40: 1209 + 31 = 1240
Step 41: 1240 + 31 = 1271
Step 42: 1271 + 31 = 1302
Step 43: 1302 + 31 = 1333
Step 44: 1333 + 31 = 1364
Step 45: 1364 + 31 = 1395
Step 46: 1395 + 31 = 1426
Step 47: 1426 + 31 = 1457
Step 48: 1457 + 31 = 1488
Step 49: 1488 + 31 = 1519
Step 50: 1519 + 31 = 1550
Step 51: 1550 + 31 = 1581
Step 52: 1581 + 31 = 1612
Step 53: 1612 + 31 = 1643
Step 54: 1643 + 31 = 1674
Step 55: 1674 + 31 = 1705
Step 56: 1705 + 31 = 1736
Step 57: 1736 + 31 = 1767
Step 58: 1767 + 31 = 1798
Step 59: 1798 + 31 = 1829
Step 60: 1829 + 31 = 1860
Step 61: 1860 + 31 = 1891
Step 62: 1891 + 31 = 1922
Step 63: 1922 + 31 = 1953
Step 64: 1953 + 31 = 1984
Step 65: 1984 + 31 = 2015
Step 66: 2015 + 31 = 2046
Step 67: 2046 + 31 = 2077
Step 68: 2077 + 31 = 2108
Step 69: 2108 + 31 = 2139
Step 70: 2139 + 31 = 2170
Step 71: 2170 + 31 = 2201
Step 72: 2201 + 31 = 2232
Step 73: 2232 + 31 = 2263
Step 74: 2263 + 31 = 2294
Step 75: 2294 + 31 = 2325
Step 76: 2325 + 31 = 2356
Step 77: 2356 + 31 = 2387
Step 78: 2387 + 31 = 2418
Step 79: 2418 + 31 = 2449
Step 80: 2449 + 31 = 2480
Step 81: 2480 + 31 = 2511
Step 82: 2511 + 31 = 2542
Step 83: 2542 + 31 = 2573
Step 84: 2573 + 31 = 2604
Step 85: 2604 + 31 = 2635
Step 86: 2635 + 31 = 2666
Step 87: 2666 + 31 = 2697
Step 88: 2697 + 31 = 2728
Step 89: 2728 + 31 = 2759
Step 90: 2759 + 31 = 2790
Step 91: 2790 + 31 = 2821
Step 92: 2821 + 31 = 2852
Step 93: 2852 + 31 = 2883
Step 94: 2883 + 31 = 2914
Step 95: 2914 + 31 = 2945
Step 96: 2945 + 31 = 2976
Step 97: 2976 + 31 = 3007
Step 98: 3007 + 31 = 3038
Step 99: 3038 + 31 = 3069
Step 100: 3069 + 31 = 3100
Step 101: 3100 + 31 = 3131
Step 102: 3131 + 31 = 3162
Step 103: 3162 + 31 = 3193
Step 104: 3193 + 31 = 3224
Step 105: 3224 + 31 = 3255
Step 106: 3255 + 31 = 3286
Step 107: 3286 + 31 = 3317
Step 108: 3317 + 31 = 3348
Step 109: 3348 + 31 = 3379
Step 110: 3379 + 31 = 3410
Step 111: 3410 + 31 = 3441
Step 112: 3441 + 31 = 3472
Step 113: 3472 + 31 = 3503
Step 114: 3503 + 31 = 3534
Step 115: 3534 + 31 = 3565
Step 116: 3565 + 31 = 3596
Step 117: 3596 + 31 = 3627
Step 118: 3627 + 31 = 3658
Step 119: 3658 + 31 = 3689
Step 120: 3689 + 31 = 3720
Step 121: 3720 + 31 = 3751
Step 122: 3751 + 31 = 3782
Step 123: 3782 + 31 = 3813
Step 124: 3813 + 31 = 3844
Step 125: 3844 + 31 = 3875
Step 126: 3875 + 31 = 3906
Step 127: 3906 + 31 = 3937
Step 128: 3937 + 31 = 3968
Step 129: 3968 + 31 = 3999
Step 130: 3999 + 31 = 4030
Step 131: 4030 + 31 = 4061
Step 132: 4061 + 31 = 4092
Step 133: 4092 + 31 = 4123
Step 134: 4123 + 31 = 4154
Step 135: 4154 + 31 = 4185
Step 136: 4185 + 31 = 4216
Step 137: 4216 + 31 = 4247
Step 138: 4247 + 31 = 4278
Step 139: 4278 + 31 = 4309
Step 140: 4309 + 31 = 4340
Step 141: 4340 + 31 = 4371
Step 142: 4371 + 31 = 4402
Step 143: 4402 + 31 = 4433
Step 144: 4433 + 31 = 4464
Step 145: 4464 + 31 = 4495
Step 146: 4495 + 31 = 4526
Step 147: 4526 + 31 = 4557
Step 148: 4557 + 31 = 4588
Step 149: 4588 + 31 = 4619
Step 150: 4619 + 31 = 4650
Step 151: 4650 + 31 = 4681
Step 152: 4681 + 31 = 4712
Step 153: 4712 + 31 = 4743
Step 154: 4743 + 31 = 4774
Step 155: 4774 + 31 = 4805
Step 156: 4805 + 31 = 4836
Step 157: 4836 + 31 = 4867
Step 158: 4867 + 31 = 4898
Step 159: 4898 + 31 = 4929
Step 160: 4929 + 31 = 4960
Step 161: 4960 + 31 = 4991
Step 162: 4991 + 31 = 5022
Step 163: 5022 + 31 = 5053
Step 164: 5053 + 31 = 5084
Step 165: 5084 + 31 = 5115
Step 166: 5115 + 31 = 5146
Step 167: 5146 + 31 = 5177
Step 168: 5177 + 31 = 5208
Step 169: 5208 + 31 = 5239
Step 170: 5239 + 31 = 5270
Step 171: 5270 + 31 = 5301
Step 172: 5301 + 31 = 5332
Step 173: 5332 + 31 = 5363
Step 174: 5363 + 31 = 5394
Step 175: 5394 + 31 = 5425
Step 176: 5425 + 31 = 5456
Step 177: 5456 + 31 = 5487
Step 178: 5487 + 31 = 5518
Step 179: 5518 + 31 = 5549
Step 180: 5549 + 31 = 5580
Step 181: 5580 + 31 = 5611
Step 182: 5611 + 31 = 5642
Step 183: 5642 + 31 = 5673
Step 184: 5673 + 31 = 5704
Step 185: 5704 + 31 = 5735
Step 186: 5735 + 31 = 5766
Step 187: 5766 + 31 = 5797
Step 188: 5797 + 31 = 5828
Step 189: 5828 + 31 = 5859
Step 190: 5859 + 31 = 5890
Step 191: 5890 + 31 = 5921
Step 192: 5921 + 31 = 5952
Step 193: 5952 + 31 = 5983
Step 194: 5983 + 31 = 6014
Step 195: 6014 + 31 = 6045
Step 196: 6045 + 31 = 6076
Step 197: 6076 + 31 = 6107
Step 198: 6107 + 31 = 6138
Step 199: 6138 + 31 = 6169
Step 200: 6169 + 31 = 6200
Step 201: 6200 + 31 = 6231
Step 202: 6231 + 31 = 6262
Step 203: 6262 + 31 = 6293
Step 204: 6293 + 31 = 6324
Step 205: 6324 + 31 = 6355
Step 206: 6355 + 31 = 6386
Step 207: 6386 + 31 = 6417
Step 208: 6417 + 31 = 6448
Step 209: 6448 + 31 = 6479
Step 210: 6479 + 31 = 6510
Step 211: 6510 + 31 = 6541
Step 212: 6541 + 31 = 6572
Step 213: 6572 + 31 = 6603
Step 214: 6603 + 31 = 6634
Step 215: 6634 + 31 = 6665
Step 216: 6665 + 31 = 6696
Step 217: 6696 + 31 = 6727
Step 218: 6727 + 31 = 6758
Step 219: 6758 + 31 = 6789
Step 220: 6789 + 31 = 6820
Step 221: 6820 + 31 = 6851
Step 222: 6851 + 31 = 6882
Step 223: 6882 + 31 = 6913

So, 31*223 = 6913