OK, let's work through this together. We're starting with 261 and we're going to multiply it by 6, which means we add 261 to itself 6 times.
Step 1: 0 + 261 = 261
Step 2: 261 + 261 = 522
Step 3: 522 + 261 = 783
Step 4: 783 + 261 = 1044
Step 5: 1044 + 261 = 1305
Step 6: 1305 + 261 = 1566

So, 261*6 = 1566