OK, let's crack this. We're given 785 and our task is to multiply it by 50. Essentially, we'll be adding 785 to itself 50 times.
Step 1: 0 + 785 = 785
Step 2: 785 + 785 = 1570
Step 3: 1570 + 785 = 2355
Step 4: 2355 + 785 = 3140
Step 5: 3140 + 785 = 3925
Step 6: 3925 + 785 = 4710
Step 7: 4710 + 785 = 5495
Step 8: 5495 + 785 = 6280
Step 9: 6280 + 785 = 7065
Step 10: 7065 + 785 = 7850
Step 11: 7850 + 785 = 8635
Step 12: 8635 + 785 = 9420
Step 13: 9420 + 785 = 10205
Step 14: 10205 + 785 = 10990
Step 15: 10990 + 785 = 11775
Step 16: 11775 + 785 = 12560
Step 17: 12560 + 785 = 13345
Step 18: 13345 + 785 = 14130
Step 19: 14130 + 785 = 14915
Step 20: 14915 + 785 = 15700
Step 21: 15700 + 785 = 16485
Step 22: 16485 + 785 = 17270
Step 23: 17270 + 785 = 18055
Step 24: 18055 + 785 = 18840
Step 25: 18840 + 785 = 19625
Step 26: 19625 + 785 = 20410
Step 27: 20410 + 785 = 21195
Step 28: 21195 + 785 = 21980
Step 29: 21980 + 785 = 22765
Step 30: 22765 + 785 = 23550
Step 31: 23550 + 785 = 24335
Step 32: 24335 + 785 = 25120
Step 33: 25120 + 785 = 25905
Step 34: 25905 + 785 = 26690
Step 35: 26690 + 785 = 27475
Step 36: 27475 + 785 = 28260
Step 37: 28260 + 785 = 29045
Step 38: 29045 + 785 = 29830
Step 39: 29830 + 785 = 30615
Step 40: 30615 + 785 = 31400
Step 41: 31400 + 785 = 32185
Step 42: 32185 + 785 = 32970
Step 43: 32970 + 785 = 33755
Step 44: 33755 + 785 = 34540
Step 45: 34540 + 785 = 35325
Step 46: 35325 + 785 = 36110
Step 47: 36110 + 785 = 36895
Step 48: 36895 + 785 = 37680
Step 49: 37680 + 785 = 38465
Step 50: 38465 + 785 = 39250

So, 785*50 = 39250