40419 ÷ 9 = 4491 R0
Alright, let's work through the division of 40419 by 9 step by step.

Step 1:
9 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 4 to get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 9

Step 2:
9 goes into 40 4 times with a remainder of 4.
Write down 4 as next digit of of the result. 
Result so far: 4
Subtract 36 from 40 to get 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 9

Step 3:
9 goes into 44 4 times with a remainder of 8.
Write down 4 as next digit of of the result. 
Result so far: 44
Subtract 36 from 44 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 9

Step 4:
9 goes into 81 9 times with a remainder of 0.
Write down 9 as next digit of of the result. 
Result so far: 449
Subtract 81 from 81 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 9

Step 5:
9 goes into 9 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 4491
Subtract 9 from 9 to get 0.

The final result is 4491 with a remainder of 0.