OK, let's work through this together. We're starting with 930 and we're going to multiply it by 15, which means we add 930 to itself 15 times.
Step 1: 0 + 930 = 930
Step 2: 930 + 930 = 1860
Step 3: 1860 + 930 = 2790
Step 4: 2790 + 930 = 3720
Step 5: 3720 + 930 = 4650
Step 6: 4650 + 930 = 5580
Step 7: 5580 + 930 = 6510
Step 8: 6510 + 930 = 7440
Step 9: 7440 + 930 = 8370
Step 10: 8370 + 930 = 9300
Step 11: 9300 + 930 = 10230
Step 12: 10230 + 930 = 11160
Step 13: 11160 + 930 = 12090
Step 14: 12090 + 930 = 13020
Step 15: 13020 + 930 = 13950

So, 930*15 = 13950