OK, let's work through this together. We're starting with 380 and we're going to multiply it by 13, which means we add 380 to itself 13 times.
Step 1: 0 + 380 = 380
Step 2: 380 + 380 = 760
Step 3: 760 + 380 = 1140
Step 4: 1140 + 380 = 1520
Step 5: 1520 + 380 = 1900
Step 6: 1900 + 380 = 2280
Step 7: 2280 + 380 = 2660
Step 8: 2660 + 380 = 3040
Step 9: 3040 + 380 = 3420
Step 10: 3420 + 380 = 3800
Step 11: 3800 + 380 = 4180
Step 12: 4180 + 380 = 4560
Step 13: 4560 + 380 = 4940

So, 380*13 = 4940