Sure thing, let's get straight to it. We start with 785 and we're going to multiply it by 15, which means adding 785 to itself 15 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

So, 785*15 = 11775