Let's roll up our sleeves and solve this. We have 491 and we're going to multiply it by 9, essentially adding 491 to itself 9 times.
Step 1: 0 + 491 = 491
Step 2: 491 + 491 = 982
Step 3: 982 + 491 = 1473
Step 4: 1473 + 491 = 1964
Step 5: 1964 + 491 = 2455
Step 6: 2455 + 491 = 2946
Step 7: 2946 + 491 = 3437
Step 8: 3437 + 491 = 3928
Step 9: 3928 + 491 = 4419

So, 491*9 = 4419