81398257 ÷ 31 
We want to divide 81398257 by 31.

Going ahead to step 1:
When dividing 8 by 31, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 31

Moving on to step 2:
When dividing 81 by 31, we get 2 with a remainder of 19.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 19 after subtracting 62 from 81.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 31

Let's proceed to step 3:
193 divided by 31 is 6 with a remainder of 7.
Write down 6 as next digit of the result. 
Result so far: 26.0
Deduct 186 from 193 and we're left with 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 31

Step 4:
The number 31 fits into 79 2 times, leaving a remainder of 17.
Put 2 as the next digit of the answer. 
Result so far: 262.0
Deduct 62 from 79 and we're left with 17.
Take the next digit (8) from the dividend and append it to 17, then repeat: 178 / 31

On to step 5:
178 divided by 31 is 5 with a remainder of 23.
Use 5 as the next digit of our solution. 
Result so far: 2625.0
Deduct 155 from 178 and we're left with 23.
Include the next digit (2) from the dividend after 23, then repeat: 232 / 31

On to step 6:
232 divided by 31 is 7 with a remainder of 15.
Put 7 as the next digit of the answer. 
Result so far: 26257.0
If we subtract 217 from 232, we get 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 31

Moving on to step 7:
31 goes into 155 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 262575.0
Subtract 155 from 155 to get 0.
Include the next digit (7) from the dividend after 0, then repeat: 7 / 31

Step 8:
When dividing 7 by 31, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 2625750.0
Deduct 0 from 7 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 9:
31 goes into 70 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 2625750.2
Subtracting 62 from 70 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 10:
If we divide 80 by 31, we get 2 and a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 2625750.22
If we take 62 away from 80, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

In conclusion, the division gives 2625750.22 with a balance of 0.018.