Sure thing, let's get straight to it. We start with 309 and we're going to multiply it by 5, which means adding 309 to itself 5 times.
Step 1: 0 + 309 = 309
Step 2: 309 + 309 = 618
Step 3: 618 + 309 = 927
Step 4: 927 + 309 = 1236
Step 5: 1236 + 309 = 1545

So, 309*5 = 1545