Let's get this math done. We have 782 and we're going to multiply it by 51. This is the same as taking 782 and adding it to itself 51 times.
Step 1: 0 + 782 = 782
Step 2: 782 + 782 = 1564
Step 3: 1564 + 782 = 2346
Step 4: 2346 + 782 = 3128
Step 5: 3128 + 782 = 3910
Step 6: 3910 + 782 = 4692
Step 7: 4692 + 782 = 5474
Step 8: 5474 + 782 = 6256
Step 9: 6256 + 782 = 7038
Step 10: 7038 + 782 = 7820
Step 11: 7820 + 782 = 8602
Step 12: 8602 + 782 = 9384
Step 13: 9384 + 782 = 10166
Step 14: 10166 + 782 = 10948
Step 15: 10948 + 782 = 11730
Step 16: 11730 + 782 = 12512
Step 17: 12512 + 782 = 13294
Step 18: 13294 + 782 = 14076
Step 19: 14076 + 782 = 14858
Step 20: 14858 + 782 = 15640
Step 21: 15640 + 782 = 16422
Step 22: 16422 + 782 = 17204
Step 23: 17204 + 782 = 17986
Step 24: 17986 + 782 = 18768
Step 25: 18768 + 782 = 19550
Step 26: 19550 + 782 = 20332
Step 27: 20332 + 782 = 21114
Step 28: 21114 + 782 = 21896
Step 29: 21896 + 782 = 22678
Step 30: 22678 + 782 = 23460
Step 31: 23460 + 782 = 24242
Step 32: 24242 + 782 = 25024
Step 33: 25024 + 782 = 25806
Step 34: 25806 + 782 = 26588
Step 35: 26588 + 782 = 27370
Step 36: 27370 + 782 = 28152
Step 37: 28152 + 782 = 28934
Step 38: 28934 + 782 = 29716
Step 39: 29716 + 782 = 30498
Step 40: 30498 + 782 = 31280
Step 41: 31280 + 782 = 32062
Step 42: 32062 + 782 = 32844
Step 43: 32844 + 782 = 33626
Step 44: 33626 + 782 = 34408
Step 45: 34408 + 782 = 35190
Step 46: 35190 + 782 = 35972
Step 47: 35972 + 782 = 36754
Step 48: 36754 + 782 = 37536
Step 49: 37536 + 782 = 38318
Step 50: 38318 + 782 = 39100
Step 51: 39100 + 782 = 39882

So, 782*51 = 39882