We divide 398910 by 86
We want to divide 398910 by 86.

Going ahead to step 1:
86 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 86

Step 2:
86 goes into 39 0 times with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Take the next digit (8) from the dividend and append it to 39, then repeat: 398 / 86

Let's proceed to step 3:
398 divided by 86 is 4 with a remainder of 54.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 344 from 398 and we're left with 54.
Take the next digit (9) from the dividend and append it to 54, then repeat: 549 / 86

Let's proceed to step 4:
The number 86 fits into 549 6 times, leaving a remainder of 33.
Record the quotient 6 as the next digit in the result. 
Result so far: 46.0
Deduct 516 from 549 and we're left with 33.
Include the next digit (1) from the dividend after 33, then repeat: 331 / 86

Moving on to step 5:
The number 86 fits into 331 3 times, leaving a remainder of 73.
Record the quotient 3 as the next digit in the result. 
Result so far: 463.0
The remainder is 73 after subtracting 258 from 331.
Include the next digit (0) from the dividend after 73, then repeat: 730 / 86

On to step 6:
86 goes into 730 8 times with a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 4638.0
Subtract 688 from 730 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 7:
When dividing 420 by 86, we get 4 with a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 4638.4
Subtract 344 from 420 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 8:
86 can be fit into 760 8 times, resulting in a remainder of 72.
Use 8 as the next digit of our solution. 
Result so far: 4638.48
Subtracting 688 from 760 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 9:
86 can be fit into 720 8 times, resulting in a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 4638.488
Subtract 688 from 720 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The quotient of the division is 4638.488, and the remainder is 0.0032.