Let's divide 81571788 by 12
The aim is to understand the frequency of 12 in 81571788.

Advancing to step 1:
If we divide 8 by 12, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 12

Step 2:
81 divided by 12 is 6 with a remainder of 9.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we subtract 72 from 81, we get 9.
Grab the next digit (5) from the dividend, add it to 9, then carry on: 95 / 12

Advancing to step 3:
The number 12 fits into 95 7 times, leaving a remainder of 11.
The next digit of our result is 7. 
Result so far: 67.0
If we subtract 84 from 95, we get 11.
Fetch the next digit (7) from the dividend, attach it to 11 and continue: 117 / 12

Let's proceed to step 4:
12 goes into 117 9 times with a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 679.0
Subtracting 108 from 117 leaves us with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 12

Advancing to step 5:
12 can be fit into 91 7 times, resulting in a remainder of 7.
The number 7 becomes the next digit in our result. 
Result so far: 6797.0
If we take 84 away from 91, we end up with 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 12

Step 6:
When dividing 77 by 12, we get 6 with a remainder of 5.
Write down 6 as next digit of the result. 
Result so far: 67976.0
Deduct 72 from 77 and we're left with 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 12

Advancing to step 7:
12 goes into 58 4 times with a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 679764.0
Deduct 48 from 58 and we're left with 10.
Grab the next digit (8) from the dividend, add it to 10, then carry on: 108 / 12

Step 8:
12 can be fit into 108 9 times, resulting in a remainder of 0.
The next digit of our result is 9. 
Result so far: 6797649.0
If we take 108 away from 108, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
12 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 6797649.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
0 divided by 12 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 6797649.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 6797649.0 with a remaining 0.0.