OK, let's work through this together. We're starting with 355 and we're going to multiply it by 107, which means we add 355 to itself 107 times.
Step 1: 0 + 355 = 355
Step 2: 355 + 355 = 710
Step 3: 710 + 355 = 1065
Step 4: 1065 + 355 = 1420
Step 5: 1420 + 355 = 1775
Step 6: 1775 + 355 = 2130
Step 7: 2130 + 355 = 2485
Step 8: 2485 + 355 = 2840
Step 9: 2840 + 355 = 3195
Step 10: 3195 + 355 = 3550
Step 11: 3550 + 355 = 3905
Step 12: 3905 + 355 = 4260
Step 13: 4260 + 355 = 4615
Step 14: 4615 + 355 = 4970
Step 15: 4970 + 355 = 5325
Step 16: 5325 + 355 = 5680
Step 17: 5680 + 355 = 6035
Step 18: 6035 + 355 = 6390
Step 19: 6390 + 355 = 6745
Step 20: 6745 + 355 = 7100
Step 21: 7100 + 355 = 7455
Step 22: 7455 + 355 = 7810
Step 23: 7810 + 355 = 8165
Step 24: 8165 + 355 = 8520
Step 25: 8520 + 355 = 8875
Step 26: 8875 + 355 = 9230
Step 27: 9230 + 355 = 9585
Step 28: 9585 + 355 = 9940
Step 29: 9940 + 355 = 10295
Step 30: 10295 + 355 = 10650
Step 31: 10650 + 355 = 11005
Step 32: 11005 + 355 = 11360
Step 33: 11360 + 355 = 11715
Step 34: 11715 + 355 = 12070
Step 35: 12070 + 355 = 12425
Step 36: 12425 + 355 = 12780
Step 37: 12780 + 355 = 13135
Step 38: 13135 + 355 = 13490
Step 39: 13490 + 355 = 13845
Step 40: 13845 + 355 = 14200
Step 41: 14200 + 355 = 14555
Step 42: 14555 + 355 = 14910
Step 43: 14910 + 355 = 15265
Step 44: 15265 + 355 = 15620
Step 45: 15620 + 355 = 15975
Step 46: 15975 + 355 = 16330
Step 47: 16330 + 355 = 16685
Step 48: 16685 + 355 = 17040
Step 49: 17040 + 355 = 17395
Step 50: 17395 + 355 = 17750
Step 51: 17750 + 355 = 18105
Step 52: 18105 + 355 = 18460
Step 53: 18460 + 355 = 18815
Step 54: 18815 + 355 = 19170
Step 55: 19170 + 355 = 19525
Step 56: 19525 + 355 = 19880
Step 57: 19880 + 355 = 20235
Step 58: 20235 + 355 = 20590
Step 59: 20590 + 355 = 20945
Step 60: 20945 + 355 = 21300
Step 61: 21300 + 355 = 21655
Step 62: 21655 + 355 = 22010
Step 63: 22010 + 355 = 22365
Step 64: 22365 + 355 = 22720
Step 65: 22720 + 355 = 23075
Step 66: 23075 + 355 = 23430
Step 67: 23430 + 355 = 23785
Step 68: 23785 + 355 = 24140
Step 69: 24140 + 355 = 24495
Step 70: 24495 + 355 = 24850
Step 71: 24850 + 355 = 25205
Step 72: 25205 + 355 = 25560
Step 73: 25560 + 355 = 25915
Step 74: 25915 + 355 = 26270
Step 75: 26270 + 355 = 26625
Step 76: 26625 + 355 = 26980
Step 77: 26980 + 355 = 27335
Step 78: 27335 + 355 = 27690
Step 79: 27690 + 355 = 28045
Step 80: 28045 + 355 = 28400
Step 81: 28400 + 355 = 28755
Step 82: 28755 + 355 = 29110
Step 83: 29110 + 355 = 29465
Step 84: 29465 + 355 = 29820
Step 85: 29820 + 355 = 30175
Step 86: 30175 + 355 = 30530
Step 87: 30530 + 355 = 30885
Step 88: 30885 + 355 = 31240
Step 89: 31240 + 355 = 31595
Step 90: 31595 + 355 = 31950
Step 91: 31950 + 355 = 32305
Step 92: 32305 + 355 = 32660
Step 93: 32660 + 355 = 33015
Step 94: 33015 + 355 = 33370
Step 95: 33370 + 355 = 33725
Step 96: 33725 + 355 = 34080
Step 97: 34080 + 355 = 34435
Step 98: 34435 + 355 = 34790
Step 99: 34790 + 355 = 35145
Step 100: 35145 + 355 = 35500
Step 101: 35500 + 355 = 35855
Step 102: 35855 + 355 = 36210
Step 103: 36210 + 355 = 36565
Step 104: 36565 + 355 = 36920
Step 105: 36920 + 355 = 37275
Step 106: 37275 + 355 = 37630
Step 107: 37630 + 355 = 37985

So, 355*107 = 37985