OK, let's crack this. We're given 764 and our task is to multiply it by 57. Essentially, we'll be adding 764 to itself 57 times.
Step 1: 0 + 764 = 764
Step 2: 764 + 764 = 1528
Step 3: 1528 + 764 = 2292
Step 4: 2292 + 764 = 3056
Step 5: 3056 + 764 = 3820
Step 6: 3820 + 764 = 4584
Step 7: 4584 + 764 = 5348
Step 8: 5348 + 764 = 6112
Step 9: 6112 + 764 = 6876
Step 10: 6876 + 764 = 7640
Step 11: 7640 + 764 = 8404
Step 12: 8404 + 764 = 9168
Step 13: 9168 + 764 = 9932
Step 14: 9932 + 764 = 10696
Step 15: 10696 + 764 = 11460
Step 16: 11460 + 764 = 12224
Step 17: 12224 + 764 = 12988
Step 18: 12988 + 764 = 13752
Step 19: 13752 + 764 = 14516
Step 20: 14516 + 764 = 15280
Step 21: 15280 + 764 = 16044
Step 22: 16044 + 764 = 16808
Step 23: 16808 + 764 = 17572
Step 24: 17572 + 764 = 18336
Step 25: 18336 + 764 = 19100
Step 26: 19100 + 764 = 19864
Step 27: 19864 + 764 = 20628
Step 28: 20628 + 764 = 21392
Step 29: 21392 + 764 = 22156
Step 30: 22156 + 764 = 22920
Step 31: 22920 + 764 = 23684
Step 32: 23684 + 764 = 24448
Step 33: 24448 + 764 = 25212
Step 34: 25212 + 764 = 25976
Step 35: 25976 + 764 = 26740
Step 36: 26740 + 764 = 27504
Step 37: 27504 + 764 = 28268
Step 38: 28268 + 764 = 29032
Step 39: 29032 + 764 = 29796
Step 40: 29796 + 764 = 30560
Step 41: 30560 + 764 = 31324
Step 42: 31324 + 764 = 32088
Step 43: 32088 + 764 = 32852
Step 44: 32852 + 764 = 33616
Step 45: 33616 + 764 = 34380
Step 46: 34380 + 764 = 35144
Step 47: 35144 + 764 = 35908
Step 48: 35908 + 764 = 36672
Step 49: 36672 + 764 = 37436
Step 50: 37436 + 764 = 38200
Step 51: 38200 + 764 = 38964
Step 52: 38964 + 764 = 39728
Step 53: 39728 + 764 = 40492
Step 54: 40492 + 764 = 41256
Step 55: 41256 + 764 = 42020
Step 56: 42020 + 764 = 42784
Step 57: 42784 + 764 = 43548

So, 764*57 = 43548