87881056 ÷ 391 
The aim is to understand the frequency of 391 in 87881056.

Advancing to step 1:
When dividing 8 by 391, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 391

Let's proceed to step 2:
391 goes into 87 0 times with a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Include the next digit (8) from the dividend after 87, then repeat: 878 / 391

Going ahead to step 3:
878 divided by 391 is 2 with a remainder of 96.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 96 after subtracting 782 from 878.
Append the next digit (8) from the dividend to 96 and continue with: 968 / 391

Advancing to step 4:
The number 391 fits into 968 2 times, leaving a remainder of 186.
Put 2 as the next digit of the answer. 
Result so far: 22.0
Deduct 782 from 968 and we're left with 186.
Take the next digit (1) from the dividend and append it to 186, then repeat: 1861 / 391

Advancing to step 5:
The number 391 fits into 1861 4 times, leaving a remainder of 297.
The next digit of our result is 4. 
Result so far: 224.0
Subtracting 1564 from 1861 leaves us with 297.
Append the next digit (0) from the dividend to 297 and continue with: 2970 / 391

Let's proceed to step 6:
When dividing 2970 by 391, we get 7 with a remainder of 233.
Record the quotient 7 as the next digit in the result. 
Result so far: 2247.0
If we take 2737 away from 2970, we end up with 233.
Fetch the next digit (5) from the dividend, attach it to 233 and continue: 2335 / 391

Moving on to step 7:
2335 divided by 391 is 5 with a remainder of 380.
Record the quotient 5 as the next digit in the result. 
Result so far: 22475.0
If we take 1955 away from 2335, we end up with 380.
Append the next digit (6) from the dividend to 380 and continue with: 3806 / 391

On to step 8:
391 can be fit into 3806 9 times, resulting in a remainder of 287.
The number 9 becomes the next digit in our result. 
Result so far: 224759.0
Subtracting 3519 from 3806 leaves us with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Advancing to step 9:
The number 391 fits into 2870 7 times, leaving a remainder of 133.
Use 7 as the next digit of our solution. 
Result so far: 224759.7
If we take 2737 away from 2870, we end up with 133.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1330, and continue the process.

Let's proceed to step 10:
If we divide 1330 by 391, we get 3 and a remainder of 157.
Use 3 as the next digit of our solution. 
Result so far: 224759.73
Subtracting 1173 from 1330 leaves us with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

Going ahead to step 11:
391 goes into 1570 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 224759.734
The remainder is 6 after subtracting 1564 from 1570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 12:
391 goes into 60 0 times with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 224759.734
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 13:
If we divide 600 by 391, we get 1 and a remainder of 209.
Put 1 as the next digit of the answer. 
Result so far: 224759.73401
If we take 391 away from 600, we end up with 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Step 14:
The number 391 fits into 2090 5 times, leaving a remainder of 135.
Use 5 as the next digit of our solution. 
Result so far: 224759.734015
The remainder is 135 after subtracting 1955 from 2090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

On to step 15:
If we divide 1350 by 391, we get 3 and a remainder of 177.
The number 3 becomes the next digit in our result. 
Result so far: 224759.7340153
If we subtract 1173 from 1350, we get 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

Moving on to step 16:
1770 divided by 391 is 4 with a remainder of 206.
Use 4 as the next digit of our solution. 
Result so far: 224759.73401534
Deduct 1564 from 1770 and we're left with 206.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2060, and continue the process.

Our division results in 224759.73401534 with a remaining 2.06e-07.