Alright, let's solve this math problem step by step. First, we have the number 803. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 18. So, we're going to take the number 803 and add it to itself 18 times.
Step 1: 0 + 803 = 803
Step 2: 803 + 803 = 1606
Step 3: 1606 + 803 = 2409
Step 4: 2409 + 803 = 3212
Step 5: 3212 + 803 = 4015
Step 6: 4015 + 803 = 4818
Step 7: 4818 + 803 = 5621
Step 8: 5621 + 803 = 6424
Step 9: 6424 + 803 = 7227
Step 10: 7227 + 803 = 8030
Step 11: 8030 + 803 = 8833
Step 12: 8833 + 803 = 9636
Step 13: 9636 + 803 = 10439
Step 14: 10439 + 803 = 11242
Step 15: 11242 + 803 = 12045
Step 16: 12045 + 803 = 12848
Step 17: 12848 + 803 = 13651
Step 18: 13651 + 803 = 14454

So, 803*18 = 14454