OK, let's crack this. We're given 779 and our task is to multiply it by 13. Essentially, we'll be adding 779 to itself 13 times.
Step 1: 0 + 779 = 779
Step 2: 779 + 779 = 1558
Step 3: 1558 + 779 = 2337
Step 4: 2337 + 779 = 3116
Step 5: 3116 + 779 = 3895
Step 6: 3895 + 779 = 4674
Step 7: 4674 + 779 = 5453
Step 8: 5453 + 779 = 6232
Step 9: 6232 + 779 = 7011
Step 10: 7011 + 779 = 7790
Step 11: 7790 + 779 = 8569
Step 12: 8569 + 779 = 9348
Step 13: 9348 + 779 = 10127

So, 779*13 = 10127