OK, let's crack this. We're given 894 and our task is to multiply it by 51. Essentially, we'll be adding 894 to itself 51 times.
Step 1: 0 + 894 = 894
Step 2: 894 + 894 = 1788
Step 3: 1788 + 894 = 2682
Step 4: 2682 + 894 = 3576
Step 5: 3576 + 894 = 4470
Step 6: 4470 + 894 = 5364
Step 7: 5364 + 894 = 6258
Step 8: 6258 + 894 = 7152
Step 9: 7152 + 894 = 8046
Step 10: 8046 + 894 = 8940
Step 11: 8940 + 894 = 9834
Step 12: 9834 + 894 = 10728
Step 13: 10728 + 894 = 11622
Step 14: 11622 + 894 = 12516
Step 15: 12516 + 894 = 13410
Step 16: 13410 + 894 = 14304
Step 17: 14304 + 894 = 15198
Step 18: 15198 + 894 = 16092
Step 19: 16092 + 894 = 16986
Step 20: 16986 + 894 = 17880
Step 21: 17880 + 894 = 18774
Step 22: 18774 + 894 = 19668
Step 23: 19668 + 894 = 20562
Step 24: 20562 + 894 = 21456
Step 25: 21456 + 894 = 22350
Step 26: 22350 + 894 = 23244
Step 27: 23244 + 894 = 24138
Step 28: 24138 + 894 = 25032
Step 29: 25032 + 894 = 25926
Step 30: 25926 + 894 = 26820
Step 31: 26820 + 894 = 27714
Step 32: 27714 + 894 = 28608
Step 33: 28608 + 894 = 29502
Step 34: 29502 + 894 = 30396
Step 35: 30396 + 894 = 31290
Step 36: 31290 + 894 = 32184
Step 37: 32184 + 894 = 33078
Step 38: 33078 + 894 = 33972
Step 39: 33972 + 894 = 34866
Step 40: 34866 + 894 = 35760
Step 41: 35760 + 894 = 36654
Step 42: 36654 + 894 = 37548
Step 43: 37548 + 894 = 38442
Step 44: 38442 + 894 = 39336
Step 45: 39336 + 894 = 40230
Step 46: 40230 + 894 = 41124
Step 47: 41124 + 894 = 42018
Step 48: 42018 + 894 = 42912
Step 49: 42912 + 894 = 43806
Step 50: 43806 + 894 = 44700
Step 51: 44700 + 894 = 45594

So, 894*51 = 45594