OK, let's crack this. We're given 624 and our task is to multiply it by 235. Essentially, we'll be adding 624 to itself 235 times.
Step 1: 0 + 624 = 624
Step 2: 624 + 624 = 1248
Step 3: 1248 + 624 = 1872
Step 4: 1872 + 624 = 2496
Step 5: 2496 + 624 = 3120
Step 6: 3120 + 624 = 3744
Step 7: 3744 + 624 = 4368
Step 8: 4368 + 624 = 4992
Step 9: 4992 + 624 = 5616
Step 10: 5616 + 624 = 6240
Step 11: 6240 + 624 = 6864
Step 12: 6864 + 624 = 7488
Step 13: 7488 + 624 = 8112
Step 14: 8112 + 624 = 8736
Step 15: 8736 + 624 = 9360
Step 16: 9360 + 624 = 9984
Step 17: 9984 + 624 = 10608
Step 18: 10608 + 624 = 11232
Step 19: 11232 + 624 = 11856
Step 20: 11856 + 624 = 12480
Step 21: 12480 + 624 = 13104
Step 22: 13104 + 624 = 13728
Step 23: 13728 + 624 = 14352
Step 24: 14352 + 624 = 14976
Step 25: 14976 + 624 = 15600
Step 26: 15600 + 624 = 16224
Step 27: 16224 + 624 = 16848
Step 28: 16848 + 624 = 17472
Step 29: 17472 + 624 = 18096
Step 30: 18096 + 624 = 18720
Step 31: 18720 + 624 = 19344
Step 32: 19344 + 624 = 19968
Step 33: 19968 + 624 = 20592
Step 34: 20592 + 624 = 21216
Step 35: 21216 + 624 = 21840
Step 36: 21840 + 624 = 22464
Step 37: 22464 + 624 = 23088
Step 38: 23088 + 624 = 23712
Step 39: 23712 + 624 = 24336
Step 40: 24336 + 624 = 24960
Step 41: 24960 + 624 = 25584
Step 42: 25584 + 624 = 26208
Step 43: 26208 + 624 = 26832
Step 44: 26832 + 624 = 27456
Step 45: 27456 + 624 = 28080
Step 46: 28080 + 624 = 28704
Step 47: 28704 + 624 = 29328
Step 48: 29328 + 624 = 29952
Step 49: 29952 + 624 = 30576
Step 50: 30576 + 624 = 31200
Step 51: 31200 + 624 = 31824
Step 52: 31824 + 624 = 32448
Step 53: 32448 + 624 = 33072
Step 54: 33072 + 624 = 33696
Step 55: 33696 + 624 = 34320
Step 56: 34320 + 624 = 34944
Step 57: 34944 + 624 = 35568
Step 58: 35568 + 624 = 36192
Step 59: 36192 + 624 = 36816
Step 60: 36816 + 624 = 37440
Step 61: 37440 + 624 = 38064
Step 62: 38064 + 624 = 38688
Step 63: 38688 + 624 = 39312
Step 64: 39312 + 624 = 39936
Step 65: 39936 + 624 = 40560
Step 66: 40560 + 624 = 41184
Step 67: 41184 + 624 = 41808
Step 68: 41808 + 624 = 42432
Step 69: 42432 + 624 = 43056
Step 70: 43056 + 624 = 43680
Step 71: 43680 + 624 = 44304
Step 72: 44304 + 624 = 44928
Step 73: 44928 + 624 = 45552
Step 74: 45552 + 624 = 46176
Step 75: 46176 + 624 = 46800
Step 76: 46800 + 624 = 47424
Step 77: 47424 + 624 = 48048
Step 78: 48048 + 624 = 48672
Step 79: 48672 + 624 = 49296
Step 80: 49296 + 624 = 49920
Step 81: 49920 + 624 = 50544
Step 82: 50544 + 624 = 51168
Step 83: 51168 + 624 = 51792
Step 84: 51792 + 624 = 52416
Step 85: 52416 + 624 = 53040
Step 86: 53040 + 624 = 53664
Step 87: 53664 + 624 = 54288
Step 88: 54288 + 624 = 54912
Step 89: 54912 + 624 = 55536
Step 90: 55536 + 624 = 56160
Step 91: 56160 + 624 = 56784
Step 92: 56784 + 624 = 57408
Step 93: 57408 + 624 = 58032
Step 94: 58032 + 624 = 58656
Step 95: 58656 + 624 = 59280
Step 96: 59280 + 624 = 59904
Step 97: 59904 + 624 = 60528
Step 98: 60528 + 624 = 61152
Step 99: 61152 + 624 = 61776
Step 100: 61776 + 624 = 62400
Step 101: 62400 + 624 = 63024
Step 102: 63024 + 624 = 63648
Step 103: 63648 + 624 = 64272
Step 104: 64272 + 624 = 64896
Step 105: 64896 + 624 = 65520
Step 106: 65520 + 624 = 66144
Step 107: 66144 + 624 = 66768
Step 108: 66768 + 624 = 67392
Step 109: 67392 + 624 = 68016
Step 110: 68016 + 624 = 68640
Step 111: 68640 + 624 = 69264
Step 112: 69264 + 624 = 69888
Step 113: 69888 + 624 = 70512
Step 114: 70512 + 624 = 71136
Step 115: 71136 + 624 = 71760
Step 116: 71760 + 624 = 72384
Step 117: 72384 + 624 = 73008
Step 118: 73008 + 624 = 73632
Step 119: 73632 + 624 = 74256
Step 120: 74256 + 624 = 74880
Step 121: 74880 + 624 = 75504
Step 122: 75504 + 624 = 76128
Step 123: 76128 + 624 = 76752
Step 124: 76752 + 624 = 77376
Step 125: 77376 + 624 = 78000
Step 126: 78000 + 624 = 78624
Step 127: 78624 + 624 = 79248
Step 128: 79248 + 624 = 79872
Step 129: 79872 + 624 = 80496
Step 130: 80496 + 624 = 81120
Step 131: 81120 + 624 = 81744
Step 132: 81744 + 624 = 82368
Step 133: 82368 + 624 = 82992
Step 134: 82992 + 624 = 83616
Step 135: 83616 + 624 = 84240
Step 136: 84240 + 624 = 84864
Step 137: 84864 + 624 = 85488
Step 138: 85488 + 624 = 86112
Step 139: 86112 + 624 = 86736
Step 140: 86736 + 624 = 87360
Step 141: 87360 + 624 = 87984
Step 142: 87984 + 624 = 88608
Step 143: 88608 + 624 = 89232
Step 144: 89232 + 624 = 89856
Step 145: 89856 + 624 = 90480
Step 146: 90480 + 624 = 91104
Step 147: 91104 + 624 = 91728
Step 148: 91728 + 624 = 92352
Step 149: 92352 + 624 = 92976
Step 150: 92976 + 624 = 93600
Step 151: 93600 + 624 = 94224
Step 152: 94224 + 624 = 94848
Step 153: 94848 + 624 = 95472
Step 154: 95472 + 624 = 96096
Step 155: 96096 + 624 = 96720
Step 156: 96720 + 624 = 97344
Step 157: 97344 + 624 = 97968
Step 158: 97968 + 624 = 98592
Step 159: 98592 + 624 = 99216
Step 160: 99216 + 624 = 99840
Step 161: 99840 + 624 = 100464
Step 162: 100464 + 624 = 101088
Step 163: 101088 + 624 = 101712
Step 164: 101712 + 624 = 102336
Step 165: 102336 + 624 = 102960
Step 166: 102960 + 624 = 103584
Step 167: 103584 + 624 = 104208
Step 168: 104208 + 624 = 104832
Step 169: 104832 + 624 = 105456
Step 170: 105456 + 624 = 106080
Step 171: 106080 + 624 = 106704
Step 172: 106704 + 624 = 107328
Step 173: 107328 + 624 = 107952
Step 174: 107952 + 624 = 108576
Step 175: 108576 + 624 = 109200
Step 176: 109200 + 624 = 109824
Step 177: 109824 + 624 = 110448
Step 178: 110448 + 624 = 111072
Step 179: 111072 + 624 = 111696
Step 180: 111696 + 624 = 112320
Step 181: 112320 + 624 = 112944
Step 182: 112944 + 624 = 113568
Step 183: 113568 + 624 = 114192
Step 184: 114192 + 624 = 114816
Step 185: 114816 + 624 = 115440
Step 186: 115440 + 624 = 116064
Step 187: 116064 + 624 = 116688
Step 188: 116688 + 624 = 117312
Step 189: 117312 + 624 = 117936
Step 190: 117936 + 624 = 118560
Step 191: 118560 + 624 = 119184
Step 192: 119184 + 624 = 119808
Step 193: 119808 + 624 = 120432
Step 194: 120432 + 624 = 121056
Step 195: 121056 + 624 = 121680
Step 196: 121680 + 624 = 122304
Step 197: 122304 + 624 = 122928
Step 198: 122928 + 624 = 123552
Step 199: 123552 + 624 = 124176
Step 200: 124176 + 624 = 124800
Step 201: 124800 + 624 = 125424
Step 202: 125424 + 624 = 126048
Step 203: 126048 + 624 = 126672
Step 204: 126672 + 624 = 127296
Step 205: 127296 + 624 = 127920
Step 206: 127920 + 624 = 128544
Step 207: 128544 + 624 = 129168
Step 208: 129168 + 624 = 129792
Step 209: 129792 + 624 = 130416
Step 210: 130416 + 624 = 131040
Step 211: 131040 + 624 = 131664
Step 212: 131664 + 624 = 132288
Step 213: 132288 + 624 = 132912
Step 214: 132912 + 624 = 133536
Step 215: 133536 + 624 = 134160
Step 216: 134160 + 624 = 134784
Step 217: 134784 + 624 = 135408
Step 218: 135408 + 624 = 136032
Step 219: 136032 + 624 = 136656
Step 220: 136656 + 624 = 137280
Step 221: 137280 + 624 = 137904
Step 222: 137904 + 624 = 138528
Step 223: 138528 + 624 = 139152
Step 224: 139152 + 624 = 139776
Step 225: 139776 + 624 = 140400
Step 226: 140400 + 624 = 141024
Step 227: 141024 + 624 = 141648
Step 228: 141648 + 624 = 142272
Step 229: 142272 + 624 = 142896
Step 230: 142896 + 624 = 143520
Step 231: 143520 + 624 = 144144
Step 232: 144144 + 624 = 144768
Step 233: 144768 + 624 = 145392
Step 234: 145392 + 624 = 146016
Step 235: 146016 + 624 = 146640

So, 624*235 = 146640