Sure thing, let's get straight to it. We start with 357 and we're going to multiply it by 51, which means adding 357 to itself 51 times.
Step 1: 0 + 357 = 357
Step 2: 357 + 357 = 714
Step 3: 714 + 357 = 1071
Step 4: 1071 + 357 = 1428
Step 5: 1428 + 357 = 1785
Step 6: 1785 + 357 = 2142
Step 7: 2142 + 357 = 2499
Step 8: 2499 + 357 = 2856
Step 9: 2856 + 357 = 3213
Step 10: 3213 + 357 = 3570
Step 11: 3570 + 357 = 3927
Step 12: 3927 + 357 = 4284
Step 13: 4284 + 357 = 4641
Step 14: 4641 + 357 = 4998
Step 15: 4998 + 357 = 5355
Step 16: 5355 + 357 = 5712
Step 17: 5712 + 357 = 6069
Step 18: 6069 + 357 = 6426
Step 19: 6426 + 357 = 6783
Step 20: 6783 + 357 = 7140
Step 21: 7140 + 357 = 7497
Step 22: 7497 + 357 = 7854
Step 23: 7854 + 357 = 8211
Step 24: 8211 + 357 = 8568
Step 25: 8568 + 357 = 8925
Step 26: 8925 + 357 = 9282
Step 27: 9282 + 357 = 9639
Step 28: 9639 + 357 = 9996
Step 29: 9996 + 357 = 10353
Step 30: 10353 + 357 = 10710
Step 31: 10710 + 357 = 11067
Step 32: 11067 + 357 = 11424
Step 33: 11424 + 357 = 11781
Step 34: 11781 + 357 = 12138
Step 35: 12138 + 357 = 12495
Step 36: 12495 + 357 = 12852
Step 37: 12852 + 357 = 13209
Step 38: 13209 + 357 = 13566
Step 39: 13566 + 357 = 13923
Step 40: 13923 + 357 = 14280
Step 41: 14280 + 357 = 14637
Step 42: 14637 + 357 = 14994
Step 43: 14994 + 357 = 15351
Step 44: 15351 + 357 = 15708
Step 45: 15708 + 357 = 16065
Step 46: 16065 + 357 = 16422
Step 47: 16422 + 357 = 16779
Step 48: 16779 + 357 = 17136
Step 49: 17136 + 357 = 17493
Step 50: 17493 + 357 = 17850
Step 51: 17850 + 357 = 18207

So, 357*51 = 18207