OK, let's crack this. We're given 628 and our task is to multiply it by 78. Essentially, we'll be adding 628 to itself 78 times.
Step 1: 0 + 628 = 628
Step 2: 628 + 628 = 1256
Step 3: 1256 + 628 = 1884
Step 4: 1884 + 628 = 2512
Step 5: 2512 + 628 = 3140
Step 6: 3140 + 628 = 3768
Step 7: 3768 + 628 = 4396
Step 8: 4396 + 628 = 5024
Step 9: 5024 + 628 = 5652
Step 10: 5652 + 628 = 6280
Step 11: 6280 + 628 = 6908
Step 12: 6908 + 628 = 7536
Step 13: 7536 + 628 = 8164
Step 14: 8164 + 628 = 8792
Step 15: 8792 + 628 = 9420
Step 16: 9420 + 628 = 10048
Step 17: 10048 + 628 = 10676
Step 18: 10676 + 628 = 11304
Step 19: 11304 + 628 = 11932
Step 20: 11932 + 628 = 12560
Step 21: 12560 + 628 = 13188
Step 22: 13188 + 628 = 13816
Step 23: 13816 + 628 = 14444
Step 24: 14444 + 628 = 15072
Step 25: 15072 + 628 = 15700
Step 26: 15700 + 628 = 16328
Step 27: 16328 + 628 = 16956
Step 28: 16956 + 628 = 17584
Step 29: 17584 + 628 = 18212
Step 30: 18212 + 628 = 18840
Step 31: 18840 + 628 = 19468
Step 32: 19468 + 628 = 20096
Step 33: 20096 + 628 = 20724
Step 34: 20724 + 628 = 21352
Step 35: 21352 + 628 = 21980
Step 36: 21980 + 628 = 22608
Step 37: 22608 + 628 = 23236
Step 38: 23236 + 628 = 23864
Step 39: 23864 + 628 = 24492
Step 40: 24492 + 628 = 25120
Step 41: 25120 + 628 = 25748
Step 42: 25748 + 628 = 26376
Step 43: 26376 + 628 = 27004
Step 44: 27004 + 628 = 27632
Step 45: 27632 + 628 = 28260
Step 46: 28260 + 628 = 28888
Step 47: 28888 + 628 = 29516
Step 48: 29516 + 628 = 30144
Step 49: 30144 + 628 = 30772
Step 50: 30772 + 628 = 31400
Step 51: 31400 + 628 = 32028
Step 52: 32028 + 628 = 32656
Step 53: 32656 + 628 = 33284
Step 54: 33284 + 628 = 33912
Step 55: 33912 + 628 = 34540
Step 56: 34540 + 628 = 35168
Step 57: 35168 + 628 = 35796
Step 58: 35796 + 628 = 36424
Step 59: 36424 + 628 = 37052
Step 60: 37052 + 628 = 37680
Step 61: 37680 + 628 = 38308
Step 62: 38308 + 628 = 38936
Step 63: 38936 + 628 = 39564
Step 64: 39564 + 628 = 40192
Step 65: 40192 + 628 = 40820
Step 66: 40820 + 628 = 41448
Step 67: 41448 + 628 = 42076
Step 68: 42076 + 628 = 42704
Step 69: 42704 + 628 = 43332
Step 70: 43332 + 628 = 43960
Step 71: 43960 + 628 = 44588
Step 72: 44588 + 628 = 45216
Step 73: 45216 + 628 = 45844
Step 74: 45844 + 628 = 46472
Step 75: 46472 + 628 = 47100
Step 76: 47100 + 628 = 47728
Step 77: 47728 + 628 = 48356
Step 78: 48356 + 628 = 48984

So, 628*78 = 48984