Alright, let's solve this math problem step by step. First, we have the number 903. 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 903 and add it to itself 9 times.
Step 1: 0 + 903 = 903
Step 2: 903 + 903 = 1806
Step 3: 1806 + 903 = 2709
Step 4: 2709 + 903 = 3612
Step 5: 3612 + 903 = 4515
Step 6: 4515 + 903 = 5418
Step 7: 5418 + 903 = 6321
Step 8: 6321 + 903 = 7224
Step 9: 7224 + 903 = 8127

So, 903*9 = 8127