OK, let's work through this together. We're starting with 137 and we're going to multiply it by 13, which means we add 137 to itself 13 times.
Step 1: 0 + 137 = 137
Step 2: 137 + 137 = 274
Step 3: 274 + 137 = 411
Step 4: 411 + 137 = 548
Step 5: 548 + 137 = 685
Step 6: 685 + 137 = 822
Step 7: 822 + 137 = 959
Step 8: 959 + 137 = 1096
Step 9: 1096 + 137 = 1233
Step 10: 1233 + 137 = 1370
Step 11: 1370 + 137 = 1507
Step 12: 1507 + 137 = 1644
Step 13: 1644 + 137 = 1781

So, 137*13 = 1781