Without delay, let's solve this. We've got 648 and we will be multiplying it by 200, that is, adding 648 to itself 200 times.
Step 1: 0 + 648 = 648
Step 2: 648 + 648 = 1296
Step 3: 1296 + 648 = 1944
Step 4: 1944 + 648 = 2592
Step 5: 2592 + 648 = 3240
Step 6: 3240 + 648 = 3888
Step 7: 3888 + 648 = 4536
Step 8: 4536 + 648 = 5184
Step 9: 5184 + 648 = 5832
Step 10: 5832 + 648 = 6480
Step 11: 6480 + 648 = 7128
Step 12: 7128 + 648 = 7776
Step 13: 7776 + 648 = 8424
Step 14: 8424 + 648 = 9072
Step 15: 9072 + 648 = 9720
Step 16: 9720 + 648 = 10368
Step 17: 10368 + 648 = 11016
Step 18: 11016 + 648 = 11664
Step 19: 11664 + 648 = 12312
Step 20: 12312 + 648 = 12960
Step 21: 12960 + 648 = 13608
Step 22: 13608 + 648 = 14256
Step 23: 14256 + 648 = 14904
Step 24: 14904 + 648 = 15552
Step 25: 15552 + 648 = 16200
Step 26: 16200 + 648 = 16848
Step 27: 16848 + 648 = 17496
Step 28: 17496 + 648 = 18144
Step 29: 18144 + 648 = 18792
Step 30: 18792 + 648 = 19440
Step 31: 19440 + 648 = 20088
Step 32: 20088 + 648 = 20736
Step 33: 20736 + 648 = 21384
Step 34: 21384 + 648 = 22032
Step 35: 22032 + 648 = 22680
Step 36: 22680 + 648 = 23328
Step 37: 23328 + 648 = 23976
Step 38: 23976 + 648 = 24624
Step 39: 24624 + 648 = 25272
Step 40: 25272 + 648 = 25920
Step 41: 25920 + 648 = 26568
Step 42: 26568 + 648 = 27216
Step 43: 27216 + 648 = 27864
Step 44: 27864 + 648 = 28512
Step 45: 28512 + 648 = 29160
Step 46: 29160 + 648 = 29808
Step 47: 29808 + 648 = 30456
Step 48: 30456 + 648 = 31104
Step 49: 31104 + 648 = 31752
Step 50: 31752 + 648 = 32400
Step 51: 32400 + 648 = 33048
Step 52: 33048 + 648 = 33696
Step 53: 33696 + 648 = 34344
Step 54: 34344 + 648 = 34992
Step 55: 34992 + 648 = 35640
Step 56: 35640 + 648 = 36288
Step 57: 36288 + 648 = 36936
Step 58: 36936 + 648 = 37584
Step 59: 37584 + 648 = 38232
Step 60: 38232 + 648 = 38880
Step 61: 38880 + 648 = 39528
Step 62: 39528 + 648 = 40176
Step 63: 40176 + 648 = 40824
Step 64: 40824 + 648 = 41472
Step 65: 41472 + 648 = 42120
Step 66: 42120 + 648 = 42768
Step 67: 42768 + 648 = 43416
Step 68: 43416 + 648 = 44064
Step 69: 44064 + 648 = 44712
Step 70: 44712 + 648 = 45360
Step 71: 45360 + 648 = 46008
Step 72: 46008 + 648 = 46656
Step 73: 46656 + 648 = 47304
Step 74: 47304 + 648 = 47952
Step 75: 47952 + 648 = 48600
Step 76: 48600 + 648 = 49248
Step 77: 49248 + 648 = 49896
Step 78: 49896 + 648 = 50544
Step 79: 50544 + 648 = 51192
Step 80: 51192 + 648 = 51840
Step 81: 51840 + 648 = 52488
Step 82: 52488 + 648 = 53136
Step 83: 53136 + 648 = 53784
Step 84: 53784 + 648 = 54432
Step 85: 54432 + 648 = 55080
Step 86: 55080 + 648 = 55728
Step 87: 55728 + 648 = 56376
Step 88: 56376 + 648 = 57024
Step 89: 57024 + 648 = 57672
Step 90: 57672 + 648 = 58320
Step 91: 58320 + 648 = 58968
Step 92: 58968 + 648 = 59616
Step 93: 59616 + 648 = 60264
Step 94: 60264 + 648 = 60912
Step 95: 60912 + 648 = 61560
Step 96: 61560 + 648 = 62208
Step 97: 62208 + 648 = 62856
Step 98: 62856 + 648 = 63504
Step 99: 63504 + 648 = 64152
Step 100: 64152 + 648 = 64800
Step 101: 64800 + 648 = 65448
Step 102: 65448 + 648 = 66096
Step 103: 66096 + 648 = 66744
Step 104: 66744 + 648 = 67392
Step 105: 67392 + 648 = 68040
Step 106: 68040 + 648 = 68688
Step 107: 68688 + 648 = 69336
Step 108: 69336 + 648 = 69984
Step 109: 69984 + 648 = 70632
Step 110: 70632 + 648 = 71280
Step 111: 71280 + 648 = 71928
Step 112: 71928 + 648 = 72576
Step 113: 72576 + 648 = 73224
Step 114: 73224 + 648 = 73872
Step 115: 73872 + 648 = 74520
Step 116: 74520 + 648 = 75168
Step 117: 75168 + 648 = 75816
Step 118: 75816 + 648 = 76464
Step 119: 76464 + 648 = 77112
Step 120: 77112 + 648 = 77760
Step 121: 77760 + 648 = 78408
Step 122: 78408 + 648 = 79056
Step 123: 79056 + 648 = 79704
Step 124: 79704 + 648 = 80352
Step 125: 80352 + 648 = 81000
Step 126: 81000 + 648 = 81648
Step 127: 81648 + 648 = 82296
Step 128: 82296 + 648 = 82944
Step 129: 82944 + 648 = 83592
Step 130: 83592 + 648 = 84240
Step 131: 84240 + 648 = 84888
Step 132: 84888 + 648 = 85536
Step 133: 85536 + 648 = 86184
Step 134: 86184 + 648 = 86832
Step 135: 86832 + 648 = 87480
Step 136: 87480 + 648 = 88128
Step 137: 88128 + 648 = 88776
Step 138: 88776 + 648 = 89424
Step 139: 89424 + 648 = 90072
Step 140: 90072 + 648 = 90720
Step 141: 90720 + 648 = 91368
Step 142: 91368 + 648 = 92016
Step 143: 92016 + 648 = 92664
Step 144: 92664 + 648 = 93312
Step 145: 93312 + 648 = 93960
Step 146: 93960 + 648 = 94608
Step 147: 94608 + 648 = 95256
Step 148: 95256 + 648 = 95904
Step 149: 95904 + 648 = 96552
Step 150: 96552 + 648 = 97200
Step 151: 97200 + 648 = 97848
Step 152: 97848 + 648 = 98496
Step 153: 98496 + 648 = 99144
Step 154: 99144 + 648 = 99792
Step 155: 99792 + 648 = 100440
Step 156: 100440 + 648 = 101088
Step 157: 101088 + 648 = 101736
Step 158: 101736 + 648 = 102384
Step 159: 102384 + 648 = 103032
Step 160: 103032 + 648 = 103680
Step 161: 103680 + 648 = 104328
Step 162: 104328 + 648 = 104976
Step 163: 104976 + 648 = 105624
Step 164: 105624 + 648 = 106272
Step 165: 106272 + 648 = 106920
Step 166: 106920 + 648 = 107568
Step 167: 107568 + 648 = 108216
Step 168: 108216 + 648 = 108864
Step 169: 108864 + 648 = 109512
Step 170: 109512 + 648 = 110160
Step 171: 110160 + 648 = 110808
Step 172: 110808 + 648 = 111456
Step 173: 111456 + 648 = 112104
Step 174: 112104 + 648 = 112752
Step 175: 112752 + 648 = 113400
Step 176: 113400 + 648 = 114048
Step 177: 114048 + 648 = 114696
Step 178: 114696 + 648 = 115344
Step 179: 115344 + 648 = 115992
Step 180: 115992 + 648 = 116640
Step 181: 116640 + 648 = 117288
Step 182: 117288 + 648 = 117936
Step 183: 117936 + 648 = 118584
Step 184: 118584 + 648 = 119232
Step 185: 119232 + 648 = 119880
Step 186: 119880 + 648 = 120528
Step 187: 120528 + 648 = 121176
Step 188: 121176 + 648 = 121824
Step 189: 121824 + 648 = 122472
Step 190: 122472 + 648 = 123120
Step 191: 123120 + 648 = 123768
Step 192: 123768 + 648 = 124416
Step 193: 124416 + 648 = 125064
Step 194: 125064 + 648 = 125712
Step 195: 125712 + 648 = 126360
Step 196: 126360 + 648 = 127008
Step 197: 127008 + 648 = 127656
Step 198: 127656 + 648 = 128304
Step 199: 128304 + 648 = 128952
Step 200: 128952 + 648 = 129600

So, 648*200 = 129600