Alright, let's solve this math problem step by step. First, we have the number 501. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 9. So, we're going to take the number 501 and add it to itself 9 times.
Step 1: 0 + 501 = 501
Step 2: 501 + 501 = 1002
Step 3: 1002 + 501 = 1503
Step 4: 1503 + 501 = 2004
Step 5: 2004 + 501 = 2505
Step 6: 2505 + 501 = 3006
Step 7: 3006 + 501 = 3507
Step 8: 3507 + 501 = 4008
Step 9: 4008 + 501 = 4509

So, 501*9 = 4509