31211235 divided by 813 
We want to figure out the number of times 31211235 can be divided by 813.

Moving on to step 1:
The number 813 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 813

Step 2:
813 goes into 31 0 times with a remainder of 31.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 31 and we're left with 31.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 813

Moving on to step 3:
813 can be fit into 312 0 times, resulting in a remainder of 312.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 312 to get 312.
Append the next digit (1) from the dividend to 312 and continue with: 3121 / 813

On to step 4:
If we divide 3121 by 813, we get 3 and a remainder of 682.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 682 after subtracting 2439 from 3121.
Append the next digit (1) from the dividend to 682 and continue with: 6821 / 813

Going ahead to step 5:
When dividing 6821 by 813, we get 8 with a remainder of 317.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
If we take 6504 away from 6821, we end up with 317.
Bring next digit (2) of the dividend behind the 317 and repeat the process: 3172 / 813

Step 6:
If we divide 3172 by 813, we get 3 and a remainder of 733.
Use 3 as the next digit of our solution. 
Result so far: 383.0
The remainder is 733 after subtracting 2439 from 3172.
Append the next digit (3) from the dividend to 733 and continue with: 7333 / 813

Let's proceed to step 7:
The number 813 fits into 7333 9 times, leaving a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 3839.0
If we take 7317 away from 7333, we end up with 16.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 813

Advancing to step 8:
When dividing 165 by 813, we get 0 with a remainder of 165.
Write down 0 as next digit of the result. 
Result so far: 38390.0
Subtract 0 from 165 to get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Going ahead to step 9:
813 can be fit into 1650 2 times, resulting in a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 38390.2
Subtracting 1626 from 1650 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 10:
240 divided by 813 is 0 with a remainder of 240.
Write down 0 as next digit of the result. 
Result so far: 38390.2
If we subtract 0 from 240, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 11:
If we divide 2400 by 813, we get 2 and a remainder of 774.
Record the quotient 2 as the next digit in the result. 
Result so far: 38390.202
If we subtract 1626 from 2400, we get 774.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7740, and continue the process.

Advancing to step 12:
813 can be fit into 7740 9 times, resulting in a remainder of 423.
Put 9 as the next digit of the answer. 
Result so far: 38390.2029
Subtract 7317 from 7740 to get 423.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4230, and continue the process.

Moving on to step 13:
When dividing 4230 by 813, we get 5 with a remainder of 165.
Put 5 as the next digit of the answer. 
Result so far: 38390.20295
If we take 4065 away from 4230, we end up with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Moving on to step 14:
If we divide 1650 by 813, we get 2 and a remainder of 24.
The number 2 becomes the next digit in our result. 
Result so far: 38390.202952
Deduct 1626 from 1650 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 15:
813 goes into 240 0 times with a remainder of 240.
The next digit of our result is 0. 
Result so far: 38390.202952
Deduct 0 from 240 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 16:
813 goes into 2400 2 times with a remainder of 774.
Use 2 as the next digit of our solution. 
Result so far: 38390.20295202
Deduct 1626 from 2400 and we're left with 774.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7740, and continue the process.

After the division, we end up with 38390.20295202 and a remainder of 7.74e-07.