OK, let's crack this. We're given 675 and our task is to multiply it by 78. Essentially, we'll be adding 675 to itself 78 times.
Step 1: 0 + 675 = 675
Step 2: 675 + 675 = 1350
Step 3: 1350 + 675 = 2025
Step 4: 2025 + 675 = 2700
Step 5: 2700 + 675 = 3375
Step 6: 3375 + 675 = 4050
Step 7: 4050 + 675 = 4725
Step 8: 4725 + 675 = 5400
Step 9: 5400 + 675 = 6075
Step 10: 6075 + 675 = 6750
Step 11: 6750 + 675 = 7425
Step 12: 7425 + 675 = 8100
Step 13: 8100 + 675 = 8775
Step 14: 8775 + 675 = 9450
Step 15: 9450 + 675 = 10125
Step 16: 10125 + 675 = 10800
Step 17: 10800 + 675 = 11475
Step 18: 11475 + 675 = 12150
Step 19: 12150 + 675 = 12825
Step 20: 12825 + 675 = 13500
Step 21: 13500 + 675 = 14175
Step 22: 14175 + 675 = 14850
Step 23: 14850 + 675 = 15525
Step 24: 15525 + 675 = 16200
Step 25: 16200 + 675 = 16875
Step 26: 16875 + 675 = 17550
Step 27: 17550 + 675 = 18225
Step 28: 18225 + 675 = 18900
Step 29: 18900 + 675 = 19575
Step 30: 19575 + 675 = 20250
Step 31: 20250 + 675 = 20925
Step 32: 20925 + 675 = 21600
Step 33: 21600 + 675 = 22275
Step 34: 22275 + 675 = 22950
Step 35: 22950 + 675 = 23625
Step 36: 23625 + 675 = 24300
Step 37: 24300 + 675 = 24975
Step 38: 24975 + 675 = 25650
Step 39: 25650 + 675 = 26325
Step 40: 26325 + 675 = 27000
Step 41: 27000 + 675 = 27675
Step 42: 27675 + 675 = 28350
Step 43: 28350 + 675 = 29025
Step 44: 29025 + 675 = 29700
Step 45: 29700 + 675 = 30375
Step 46: 30375 + 675 = 31050
Step 47: 31050 + 675 = 31725
Step 48: 31725 + 675 = 32400
Step 49: 32400 + 675 = 33075
Step 50: 33075 + 675 = 33750
Step 51: 33750 + 675 = 34425
Step 52: 34425 + 675 = 35100
Step 53: 35100 + 675 = 35775
Step 54: 35775 + 675 = 36450
Step 55: 36450 + 675 = 37125
Step 56: 37125 + 675 = 37800
Step 57: 37800 + 675 = 38475
Step 58: 38475 + 675 = 39150
Step 59: 39150 + 675 = 39825
Step 60: 39825 + 675 = 40500
Step 61: 40500 + 675 = 41175
Step 62: 41175 + 675 = 41850
Step 63: 41850 + 675 = 42525
Step 64: 42525 + 675 = 43200
Step 65: 43200 + 675 = 43875
Step 66: 43875 + 675 = 44550
Step 67: 44550 + 675 = 45225
Step 68: 45225 + 675 = 45900
Step 69: 45900 + 675 = 46575
Step 70: 46575 + 675 = 47250
Step 71: 47250 + 675 = 47925
Step 72: 47925 + 675 = 48600
Step 73: 48600 + 675 = 49275
Step 74: 49275 + 675 = 49950
Step 75: 49950 + 675 = 50625
Step 76: 50625 + 675 = 51300
Step 77: 51300 + 675 = 51975
Step 78: 51975 + 675 = 52650

So, 675*78 = 52650