87392248 ÷ 81 
The aim is to understand the frequency of 81 in 87392248.

Step 1:
The number 81 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 81

On to step 2:
When dividing 87 by 81, we get 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 81 from 87, we get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 81

Advancing to step 3:
The number 81 fits into 63 0 times, leaving a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 63, we end up with 63.
Bring next digit (9) of the dividend behind the 63 and repeat the process: 639 / 81

Going ahead to step 4:
81 goes into 639 7 times with a remainder of 72.
Write down 7 as next digit of the result. 
Result so far: 107.0
If we take 567 away from 639, we end up with 72.
Fetch the next digit (2) from the dividend, attach it to 72 and continue: 722 / 81

Advancing to step 5:
The number 81 fits into 722 8 times, leaving a remainder of 74.
Write down 8 as next digit of the result. 
Result so far: 1078.0
Deduct 648 from 722 and we're left with 74.
Take the next digit (2) from the dividend and append it to 74, then repeat: 742 / 81

Let's proceed to step 6:
If we divide 742 by 81, we get 9 and a remainder of 13.
The next digit of our result is 9. 
Result so far: 10789.0
The remainder is 13 after subtracting 729 from 742.
Grab the next digit (4) from the dividend, add it to 13, then carry on: 134 / 81

Moving on to step 7:
If we divide 134 by 81, we get 1 and a remainder of 53.
Write down 1 as next digit of the result. 
Result so far: 107891.0
If we subtract 81 from 134, we get 53.
Grab the next digit (8) from the dividend, add it to 53, then carry on: 538 / 81

Moving on to step 8:
When dividing 538 by 81, we get 6 with a remainder of 52.
The number 6 becomes the next digit in our result. 
Result so far: 1078916.0
If we subtract 486 from 538, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 9:
When dividing 520 by 81, we get 6 with a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 1078916.6
If we subtract 486 from 520, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 10:
The number 81 fits into 340 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 1078916.64
The remainder is 16 after subtracting 324 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 11:
81 can be fit into 160 1 times, resulting in a remainder of 79.
The number 1 becomes the next digit in our result. 
Result so far: 1078916.641
Subtracting 81 from 160 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 12:
790 divided by 81 is 9 with a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 1078916.6419
Deduct 729 from 790 and we're left with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 13:
The number 81 fits into 610 7 times, leaving a remainder of 43.
Write down 7 as next digit of the result. 
Result so far: 1078916.64197
Subtract 567 from 610 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 14:
When dividing 430 by 81, we get 5 with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 1078916.641975
Subtract 405 from 430 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 15:
81 goes into 250 3 times with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 1078916.6419753
If we take 243 away from 250, we end up 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.

Advancing to step 16:
70 divided by 81 is 0 with a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 1078916.6419753
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 1078916.6419753, with a leftover of 7e-08.