Let's get this math done. We have 605 and we're going to multiply it by 100. This is the same as taking 605 and adding it to itself 100 times.
Step 1: 0 + 605 = 605
Step 2: 605 + 605 = 1210
Step 3: 1210 + 605 = 1815
Step 4: 1815 + 605 = 2420
Step 5: 2420 + 605 = 3025
Step 6: 3025 + 605 = 3630
Step 7: 3630 + 605 = 4235
Step 8: 4235 + 605 = 4840
Step 9: 4840 + 605 = 5445
Step 10: 5445 + 605 = 6050
Step 11: 6050 + 605 = 6655
Step 12: 6655 + 605 = 7260
Step 13: 7260 + 605 = 7865
Step 14: 7865 + 605 = 8470
Step 15: 8470 + 605 = 9075
Step 16: 9075 + 605 = 9680
Step 17: 9680 + 605 = 10285
Step 18: 10285 + 605 = 10890
Step 19: 10890 + 605 = 11495
Step 20: 11495 + 605 = 12100
Step 21: 12100 + 605 = 12705
Step 22: 12705 + 605 = 13310
Step 23: 13310 + 605 = 13915
Step 24: 13915 + 605 = 14520
Step 25: 14520 + 605 = 15125
Step 26: 15125 + 605 = 15730
Step 27: 15730 + 605 = 16335
Step 28: 16335 + 605 = 16940
Step 29: 16940 + 605 = 17545
Step 30: 17545 + 605 = 18150
Step 31: 18150 + 605 = 18755
Step 32: 18755 + 605 = 19360
Step 33: 19360 + 605 = 19965
Step 34: 19965 + 605 = 20570
Step 35: 20570 + 605 = 21175
Step 36: 21175 + 605 = 21780
Step 37: 21780 + 605 = 22385
Step 38: 22385 + 605 = 22990
Step 39: 22990 + 605 = 23595
Step 40: 23595 + 605 = 24200
Step 41: 24200 + 605 = 24805
Step 42: 24805 + 605 = 25410
Step 43: 25410 + 605 = 26015
Step 44: 26015 + 605 = 26620
Step 45: 26620 + 605 = 27225
Step 46: 27225 + 605 = 27830
Step 47: 27830 + 605 = 28435
Step 48: 28435 + 605 = 29040
Step 49: 29040 + 605 = 29645
Step 50: 29645 + 605 = 30250
Step 51: 30250 + 605 = 30855
Step 52: 30855 + 605 = 31460
Step 53: 31460 + 605 = 32065
Step 54: 32065 + 605 = 32670
Step 55: 32670 + 605 = 33275
Step 56: 33275 + 605 = 33880
Step 57: 33880 + 605 = 34485
Step 58: 34485 + 605 = 35090
Step 59: 35090 + 605 = 35695
Step 60: 35695 + 605 = 36300
Step 61: 36300 + 605 = 36905
Step 62: 36905 + 605 = 37510
Step 63: 37510 + 605 = 38115
Step 64: 38115 + 605 = 38720
Step 65: 38720 + 605 = 39325
Step 66: 39325 + 605 = 39930
Step 67: 39930 + 605 = 40535
Step 68: 40535 + 605 = 41140
Step 69: 41140 + 605 = 41745
Step 70: 41745 + 605 = 42350
Step 71: 42350 + 605 = 42955
Step 72: 42955 + 605 = 43560
Step 73: 43560 + 605 = 44165
Step 74: 44165 + 605 = 44770
Step 75: 44770 + 605 = 45375
Step 76: 45375 + 605 = 45980
Step 77: 45980 + 605 = 46585
Step 78: 46585 + 605 = 47190
Step 79: 47190 + 605 = 47795
Step 80: 47795 + 605 = 48400
Step 81: 48400 + 605 = 49005
Step 82: 49005 + 605 = 49610
Step 83: 49610 + 605 = 50215
Step 84: 50215 + 605 = 50820
Step 85: 50820 + 605 = 51425
Step 86: 51425 + 605 = 52030
Step 87: 52030 + 605 = 52635
Step 88: 52635 + 605 = 53240
Step 89: 53240 + 605 = 53845
Step 90: 53845 + 605 = 54450
Step 91: 54450 + 605 = 55055
Step 92: 55055 + 605 = 55660
Step 93: 55660 + 605 = 56265
Step 94: 56265 + 605 = 56870
Step 95: 56870 + 605 = 57475
Step 96: 57475 + 605 = 58080
Step 97: 58080 + 605 = 58685
Step 98: 58685 + 605 = 59290
Step 99: 59290 + 605 = 59895
Step 100: 59895 + 605 = 60500

So, 605*100 = 60500