OK, let's crack this. We're given 787 and our task is to multiply it by 16. Essentially, we'll be adding 787 to itself 16 times.
Step 1: 0 + 787 = 787
Step 2: 787 + 787 = 1574
Step 3: 1574 + 787 = 2361
Step 4: 2361 + 787 = 3148
Step 5: 3148 + 787 = 3935
Step 6: 3935 + 787 = 4722
Step 7: 4722 + 787 = 5509
Step 8: 5509 + 787 = 6296
Step 9: 6296 + 787 = 7083
Step 10: 7083 + 787 = 7870
Step 11: 7870 + 787 = 8657
Step 12: 8657 + 787 = 9444
Step 13: 9444 + 787 = 10231
Step 14: 10231 + 787 = 11018
Step 15: 11018 + 787 = 11805
Step 16: 11805 + 787 = 12592

So, 787*16 = 12592