Alright, let's solve this math problem step by step. First, we have the number 243. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 5. So, we're going to take the number 243 and add it to itself 5 times.
Step 1: 0 + 243 = 243
Step 2: 243 + 243 = 486
Step 3: 486 + 243 = 729
Step 4: 729 + 243 = 972
Step 5: 972 + 243 = 1215

So, 243*5 = 1215