90687881 divided by 331 
The aim is to understand the frequency of 331 in 90687881.

Moving on to step 1:
If we divide 9 by 331, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 331

Step 2:
331 goes into 90 0 times with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Bring next digit (6) of the dividend behind the 90 and repeat the process: 906 / 331

Moving on to step 3:
906 divided by 331 is 2 with a remainder of 244.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 662 from 906 and we're left with 244.
Bring next digit (8) of the dividend behind the 244 and repeat the process: 2448 / 331

Advancing to step 4:
When dividing 2448 by 331, we get 7 with a remainder of 131.
The next digit of our result is 7. 
Result so far: 27.0
Subtracting 2317 from 2448 leaves us with 131.
Grab the next digit (7) from the dividend, add it to 131, then carry on: 1317 / 331

Let's proceed to step 5:
331 goes into 1317 3 times with a remainder of 324.
The number 3 becomes the next digit in our result. 
Result so far: 273.0
Subtracting 993 from 1317 leaves us with 324.
Include the next digit (8) from the dividend after 324, then repeat: 3248 / 331

On to step 6:
When dividing 3248 by 331, we get 9 with a remainder of 269.
The number 9 becomes the next digit in our result. 
Result so far: 2739.0
Subtract 2979 from 3248 to get 269.
Include the next digit (8) from the dividend after 269, then repeat: 2698 / 331

Advancing to step 7:
331 can be fit into 2698 8 times, resulting in a remainder of 50.
Write down 8 as next digit of the result. 
Result so far: 27398.0
If we take 2648 away from 2698, we end up with 50.
Take the next digit (1) from the dividend and append it to 50, then repeat: 501 / 331

Moving on to step 8:
501 divided by 331 is 1 with a remainder of 170.
Write down 1 as next digit of the result. 
Result so far: 273981.0
Subtract 331 from 501 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Advancing to step 9:
When dividing 1700 by 331, we get 5 with a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 273981.5
If we take 1655 away from 1700, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 10:
If we divide 450 by 331, we get 1 and a remainder of 119.
Put 1 as the next digit of the answer. 
Result so far: 273981.51
Subtracting 331 from 450 leaves us with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Moving on to step 11:
1190 divided by 331 is 3 with a remainder of 197.
Put 3 as the next digit of the answer. 
Result so far: 273981.513
Subtracting 993 from 1190 leaves us with 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Advancing to step 12:
If we divide 1970 by 331, we get 5 and a remainder of 315.
Record the quotient 5 as the next digit in the result. 
Result so far: 273981.5135
Deduct 1655 from 1970 and we're left with 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Moving on to step 13:
The number 331 fits into 3150 9 times, leaving a remainder of 171.
The next digit of our result is 9. 
Result so far: 273981.51359
Subtracting 2979 from 3150 leaves us with 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Advancing to step 14:
If we divide 1710 by 331, we get 5 and a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 273981.513595
If we subtract 1655 from 1710, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 15:
When dividing 550 by 331, we get 1 with a remainder of 219.
Write down 1 as next digit of the result. 
Result so far: 273981.5135951
The remainder is 219 after subtracting 331 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Step 16:
2190 divided by 331 is 6 with a remainder of 204.
Use 6 as the next digit of our solution. 
Result so far: 273981.51359516
Deduct 1986 from 2190 and we're left with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

The quotient of the division is 273981.51359516, and the remainder is 2.04e-07.