OK, let's crack this. We're given 266 and our task is to multiply it by 13. Essentially, we'll be adding 266 to itself 13 times.
Step 1: 0 + 266 = 266
Step 2: 266 + 266 = 532
Step 3: 532 + 266 = 798
Step 4: 798 + 266 = 1064
Step 5: 1064 + 266 = 1330
Step 6: 1330 + 266 = 1596
Step 7: 1596 + 266 = 1862
Step 8: 1862 + 266 = 2128
Step 9: 2128 + 266 = 2394
Step 10: 2394 + 266 = 2660
Step 11: 2660 + 266 = 2926
Step 12: 2926 + 266 = 3192
Step 13: 3192 + 266 = 3458

So, 266*13 = 3458