OK, let's work through this together. We're starting with 455 and we're going to multiply it by 3, which means we add 455 to itself 3 times.
Step 1: 0 + 455 = 455
Step 2: 455 + 455 = 910
Step 3: 910 + 455 = 1365

So, 455*3 = 1365