OK, let's crack this. We're given 860 and our task is to multiply it by 17. Essentially, we'll be adding 860 to itself 17 times.
Step 1: 0 + 860 = 860
Step 2: 860 + 860 = 1720
Step 3: 1720 + 860 = 2580
Step 4: 2580 + 860 = 3440
Step 5: 3440 + 860 = 4300
Step 6: 4300 + 860 = 5160
Step 7: 5160 + 860 = 6020
Step 8: 6020 + 860 = 6880
Step 9: 6880 + 860 = 7740
Step 10: 7740 + 860 = 8600
Step 11: 8600 + 860 = 9460
Step 12: 9460 + 860 = 10320
Step 13: 10320 + 860 = 11180
Step 14: 11180 + 860 = 12040
Step 15: 12040 + 860 = 12900
Step 16: 12900 + 860 = 13760
Step 17: 13760 + 860 = 14620

So, 860*17 = 14620