OK, let's crack this. We're given 631 and our task is to multiply it by 106. Essentially, we'll be adding 631 to itself 106 times.
Step 1: 0 + 631 = 631
Step 2: 631 + 631 = 1262
Step 3: 1262 + 631 = 1893
Step 4: 1893 + 631 = 2524
Step 5: 2524 + 631 = 3155
Step 6: 3155 + 631 = 3786
Step 7: 3786 + 631 = 4417
Step 8: 4417 + 631 = 5048
Step 9: 5048 + 631 = 5679
Step 10: 5679 + 631 = 6310
Step 11: 6310 + 631 = 6941
Step 12: 6941 + 631 = 7572
Step 13: 7572 + 631 = 8203
Step 14: 8203 + 631 = 8834
Step 15: 8834 + 631 = 9465
Step 16: 9465 + 631 = 10096
Step 17: 10096 + 631 = 10727
Step 18: 10727 + 631 = 11358
Step 19: 11358 + 631 = 11989
Step 20: 11989 + 631 = 12620
Step 21: 12620 + 631 = 13251
Step 22: 13251 + 631 = 13882
Step 23: 13882 + 631 = 14513
Step 24: 14513 + 631 = 15144
Step 25: 15144 + 631 = 15775
Step 26: 15775 + 631 = 16406
Step 27: 16406 + 631 = 17037
Step 28: 17037 + 631 = 17668
Step 29: 17668 + 631 = 18299
Step 30: 18299 + 631 = 18930
Step 31: 18930 + 631 = 19561
Step 32: 19561 + 631 = 20192
Step 33: 20192 + 631 = 20823
Step 34: 20823 + 631 = 21454
Step 35: 21454 + 631 = 22085
Step 36: 22085 + 631 = 22716
Step 37: 22716 + 631 = 23347
Step 38: 23347 + 631 = 23978
Step 39: 23978 + 631 = 24609
Step 40: 24609 + 631 = 25240
Step 41: 25240 + 631 = 25871
Step 42: 25871 + 631 = 26502
Step 43: 26502 + 631 = 27133
Step 44: 27133 + 631 = 27764
Step 45: 27764 + 631 = 28395
Step 46: 28395 + 631 = 29026
Step 47: 29026 + 631 = 29657
Step 48: 29657 + 631 = 30288
Step 49: 30288 + 631 = 30919
Step 50: 30919 + 631 = 31550
Step 51: 31550 + 631 = 32181
Step 52: 32181 + 631 = 32812
Step 53: 32812 + 631 = 33443
Step 54: 33443 + 631 = 34074
Step 55: 34074 + 631 = 34705
Step 56: 34705 + 631 = 35336
Step 57: 35336 + 631 = 35967
Step 58: 35967 + 631 = 36598
Step 59: 36598 + 631 = 37229
Step 60: 37229 + 631 = 37860
Step 61: 37860 + 631 = 38491
Step 62: 38491 + 631 = 39122
Step 63: 39122 + 631 = 39753
Step 64: 39753 + 631 = 40384
Step 65: 40384 + 631 = 41015
Step 66: 41015 + 631 = 41646
Step 67: 41646 + 631 = 42277
Step 68: 42277 + 631 = 42908
Step 69: 42908 + 631 = 43539
Step 70: 43539 + 631 = 44170
Step 71: 44170 + 631 = 44801
Step 72: 44801 + 631 = 45432
Step 73: 45432 + 631 = 46063
Step 74: 46063 + 631 = 46694
Step 75: 46694 + 631 = 47325
Step 76: 47325 + 631 = 47956
Step 77: 47956 + 631 = 48587
Step 78: 48587 + 631 = 49218
Step 79: 49218 + 631 = 49849
Step 80: 49849 + 631 = 50480
Step 81: 50480 + 631 = 51111
Step 82: 51111 + 631 = 51742
Step 83: 51742 + 631 = 52373
Step 84: 52373 + 631 = 53004
Step 85: 53004 + 631 = 53635
Step 86: 53635 + 631 = 54266
Step 87: 54266 + 631 = 54897
Step 88: 54897 + 631 = 55528
Step 89: 55528 + 631 = 56159
Step 90: 56159 + 631 = 56790
Step 91: 56790 + 631 = 57421
Step 92: 57421 + 631 = 58052
Step 93: 58052 + 631 = 58683
Step 94: 58683 + 631 = 59314
Step 95: 59314 + 631 = 59945
Step 96: 59945 + 631 = 60576
Step 97: 60576 + 631 = 61207
Step 98: 61207 + 631 = 61838
Step 99: 61838 + 631 = 62469
Step 100: 62469 + 631 = 63100
Step 101: 63100 + 631 = 63731
Step 102: 63731 + 631 = 64362
Step 103: 64362 + 631 = 64993
Step 104: 64993 + 631 = 65624
Step 105: 65624 + 631 = 66255
Step 106: 66255 + 631 = 66886

So, 631*106 = 66886