Without delay, let's solve this. We've got 139 and we will be multiplying it by 13, that is, adding 139 to itself 13 times.
Step 1: 0 + 139 = 139
Step 2: 139 + 139 = 278
Step 3: 278 + 139 = 417
Step 4: 417 + 139 = 556
Step 5: 556 + 139 = 695
Step 6: 695 + 139 = 834
Step 7: 834 + 139 = 973
Step 8: 973 + 139 = 1112
Step 9: 1112 + 139 = 1251
Step 10: 1251 + 139 = 1390
Step 11: 1390 + 139 = 1529
Step 12: 1529 + 139 = 1668
Step 13: 1668 + 139 = 1807

So, 139*13 = 1807