We look at the division of 378990 by 9 
Let's see how many times 9 fits into 378990.

Step 1:
The number 9 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (7) from the dividend after 3, then repeat: 37 / 9

On to step 2:
The number 9 fits into 37 4 times, leaving a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 36 from 37, we get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 9

Advancing to step 3:
9 goes into 18 2 times with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 42.0
The remainder is 0 after subtracting 18 from 18.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 9

Advancing to step 4:
9 divided by 9 is 1 with a remainder of 0.
The next digit of our result is 1. 
Result so far: 421.0
Subtracting 9 from 9 leaves us with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 9

Step 5:
9 goes into 9 1 times with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 4211.0
Subtract 9 from 9 to get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 9

Let's proceed to step 6:
If we divide 0 by 9, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 42110.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 7:
When dividing 0 by 9, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42110.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
When dividing 0 by 9, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 42110.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 42110.0 with a remainder of 0.0.