We're dividing 399231 by 891 
We're looking to find how many times 891 goes into 399231.

Advancing to step 1:
3 divided by 891 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 891

Moving on to step 2:
When dividing 39 by 891, we get 0 with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Include the next digit (9) from the dividend after 39, then repeat: 399 / 891

Going ahead to step 3:
When dividing 399 by 891, we get 0 with a remainder of 399.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 399 leaves us with 399.
Append the next digit (2) from the dividend to 399 and continue with: 3992 / 891

Going ahead to step 4:
891 can be fit into 3992 4 times, resulting in a remainder of 428.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 428 after subtracting 3564 from 3992.
Take the next digit (3) from the dividend and append it to 428, then repeat: 4283 / 891

Going ahead to step 5:
If we divide 4283 by 891, we get 4 and a remainder of 719.
The number 4 becomes the next digit in our result. 
Result so far: 44.0
Deduct 3564 from 4283 and we're left with 719.
Bring next digit (1) of the dividend behind the 719 and repeat the process: 7191 / 891

Moving on to step 6:
7191 divided by 891 is 8 with a remainder of 63.
Record the quotient 8 as the next digit in the result. 
Result so far: 448.0
If we take 7128 away from 7191, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 7:
891 can be fit into 630 0 times, resulting in a remainder of 630.
Put 0 as the next digit of the answer. 
Result so far: 448.0
If we subtract 0 from 630, we get 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Let's proceed to step 8:
6300 divided by 891 is 7 with a remainder of 63.
Write down 7 as next digit of the result. 
Result so far: 448.07
If we take 6237 away from 6300, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 9:
The number 891 fits into 630 0 times, leaving a remainder of 630.
Write down 0 as next digit of the result. 
Result so far: 448.07
If we subtract 0 from 630, we get 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Let's proceed to step 10:
891 can be fit into 6300 7 times, resulting in a remainder of 63.
Use 7 as the next digit of our solution. 
Result so far: 448.0707
Subtracting 6237 from 6300 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 11:
If we divide 630 by 891, we get 0 and a remainder of 630.
Write down 0 as next digit of the result. 
Result so far: 448.0707
The remainder is 630 after subtracting 0 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Step 12:
When dividing 6300 by 891, we get 7 with a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 448.070707
The remainder is 63 after subtracting 6237 from 6300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Let's proceed to step 13:
630 divided by 891 is 0 with a remainder of 630.
Record the quotient 0 as the next digit in the result. 
Result so far: 448.070707
If we take 0 away from 630, we end up with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Let's proceed to step 14:
If we divide 6300 by 891, we get 7 and a remainder of 63.
The number 7 becomes the next digit in our result. 
Result so far: 448.07070707
Deduct 6237 from 6300 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

After the division, we end up with 448.07070707 and a remainder of 6.3e-08.