OK, let's work through this together. We're starting with 507 and we're going to multiply it by 65, which means we add 507 to itself 65 times.
Step 1: 0 + 507 = 507
Step 2: 507 + 507 = 1014
Step 3: 1014 + 507 = 1521
Step 4: 1521 + 507 = 2028
Step 5: 2028 + 507 = 2535
Step 6: 2535 + 507 = 3042
Step 7: 3042 + 507 = 3549
Step 8: 3549 + 507 = 4056
Step 9: 4056 + 507 = 4563
Step 10: 4563 + 507 = 5070
Step 11: 5070 + 507 = 5577
Step 12: 5577 + 507 = 6084
Step 13: 6084 + 507 = 6591
Step 14: 6591 + 507 = 7098
Step 15: 7098 + 507 = 7605
Step 16: 7605 + 507 = 8112
Step 17: 8112 + 507 = 8619
Step 18: 8619 + 507 = 9126
Step 19: 9126 + 507 = 9633
Step 20: 9633 + 507 = 10140
Step 21: 10140 + 507 = 10647
Step 22: 10647 + 507 = 11154
Step 23: 11154 + 507 = 11661
Step 24: 11661 + 507 = 12168
Step 25: 12168 + 507 = 12675
Step 26: 12675 + 507 = 13182
Step 27: 13182 + 507 = 13689
Step 28: 13689 + 507 = 14196
Step 29: 14196 + 507 = 14703
Step 30: 14703 + 507 = 15210
Step 31: 15210 + 507 = 15717
Step 32: 15717 + 507 = 16224
Step 33: 16224 + 507 = 16731
Step 34: 16731 + 507 = 17238
Step 35: 17238 + 507 = 17745
Step 36: 17745 + 507 = 18252
Step 37: 18252 + 507 = 18759
Step 38: 18759 + 507 = 19266
Step 39: 19266 + 507 = 19773
Step 40: 19773 + 507 = 20280
Step 41: 20280 + 507 = 20787
Step 42: 20787 + 507 = 21294
Step 43: 21294 + 507 = 21801
Step 44: 21801 + 507 = 22308
Step 45: 22308 + 507 = 22815
Step 46: 22815 + 507 = 23322
Step 47: 23322 + 507 = 23829
Step 48: 23829 + 507 = 24336
Step 49: 24336 + 507 = 24843
Step 50: 24843 + 507 = 25350
Step 51: 25350 + 507 = 25857
Step 52: 25857 + 507 = 26364
Step 53: 26364 + 507 = 26871
Step 54: 26871 + 507 = 27378
Step 55: 27378 + 507 = 27885
Step 56: 27885 + 507 = 28392
Step 57: 28392 + 507 = 28899
Step 58: 28899 + 507 = 29406
Step 59: 29406 + 507 = 29913
Step 60: 29913 + 507 = 30420
Step 61: 30420 + 507 = 30927
Step 62: 30927 + 507 = 31434
Step 63: 31434 + 507 = 31941
Step 64: 31941 + 507 = 32448
Step 65: 32448 + 507 = 32955

So, 507*65 = 32955