Let's get this math done. We have 31 and we're going to multiply it by 107. This is the same as taking 31 and adding it to itself 107 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

So, 31*107 = 3317