Let's roll up our sleeves and solve this. We have 625 and we're going to multiply it by 77, essentially adding 625 to itself 77 times.
Step 1: 0 + 625 = 625
Step 2: 625 + 625 = 1250
Step 3: 1250 + 625 = 1875
Step 4: 1875 + 625 = 2500
Step 5: 2500 + 625 = 3125
Step 6: 3125 + 625 = 3750
Step 7: 3750 + 625 = 4375
Step 8: 4375 + 625 = 5000
Step 9: 5000 + 625 = 5625
Step 10: 5625 + 625 = 6250
Step 11: 6250 + 625 = 6875
Step 12: 6875 + 625 = 7500
Step 13: 7500 + 625 = 8125
Step 14: 8125 + 625 = 8750
Step 15: 8750 + 625 = 9375
Step 16: 9375 + 625 = 10000
Step 17: 10000 + 625 = 10625
Step 18: 10625 + 625 = 11250
Step 19: 11250 + 625 = 11875
Step 20: 11875 + 625 = 12500
Step 21: 12500 + 625 = 13125
Step 22: 13125 + 625 = 13750
Step 23: 13750 + 625 = 14375
Step 24: 14375 + 625 = 15000
Step 25: 15000 + 625 = 15625
Step 26: 15625 + 625 = 16250
Step 27: 16250 + 625 = 16875
Step 28: 16875 + 625 = 17500
Step 29: 17500 + 625 = 18125
Step 30: 18125 + 625 = 18750
Step 31: 18750 + 625 = 19375
Step 32: 19375 + 625 = 20000
Step 33: 20000 + 625 = 20625
Step 34: 20625 + 625 = 21250
Step 35: 21250 + 625 = 21875
Step 36: 21875 + 625 = 22500
Step 37: 22500 + 625 = 23125
Step 38: 23125 + 625 = 23750
Step 39: 23750 + 625 = 24375
Step 40: 24375 + 625 = 25000
Step 41: 25000 + 625 = 25625
Step 42: 25625 + 625 = 26250
Step 43: 26250 + 625 = 26875
Step 44: 26875 + 625 = 27500
Step 45: 27500 + 625 = 28125
Step 46: 28125 + 625 = 28750
Step 47: 28750 + 625 = 29375
Step 48: 29375 + 625 = 30000
Step 49: 30000 + 625 = 30625
Step 50: 30625 + 625 = 31250
Step 51: 31250 + 625 = 31875
Step 52: 31875 + 625 = 32500
Step 53: 32500 + 625 = 33125
Step 54: 33125 + 625 = 33750
Step 55: 33750 + 625 = 34375
Step 56: 34375 + 625 = 35000
Step 57: 35000 + 625 = 35625
Step 58: 35625 + 625 = 36250
Step 59: 36250 + 625 = 36875
Step 60: 36875 + 625 = 37500
Step 61: 37500 + 625 = 38125
Step 62: 38125 + 625 = 38750
Step 63: 38750 + 625 = 39375
Step 64: 39375 + 625 = 40000
Step 65: 40000 + 625 = 40625
Step 66: 40625 + 625 = 41250
Step 67: 41250 + 625 = 41875
Step 68: 41875 + 625 = 42500
Step 69: 42500 + 625 = 43125
Step 70: 43125 + 625 = 43750
Step 71: 43750 + 625 = 44375
Step 72: 44375 + 625 = 45000
Step 73: 45000 + 625 = 45625
Step 74: 45625 + 625 = 46250
Step 75: 46250 + 625 = 46875
Step 76: 46875 + 625 = 47500
Step 77: 47500 + 625 = 48125

So, 625*77 = 48125