OK, let's work through this together. We're starting with 303 and we're going to multiply it by 4, which means we add 303 to itself 4 times.
Step 1: 0 + 303 = 303
Step 2: 303 + 303 = 606
Step 3: 606 + 303 = 909
Step 4: 909 + 303 = 1212

So, 303*4 = 1212