71954912 ÷ 815 
The aim is to understand the frequency of 815 in 71954912.

Step 1:
If we divide 7 by 815, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 815

Let's proceed to step 2:
815 can be fit into 71 0 times, resulting in a remainder of 71.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 71 to get 71.
Grab the next digit (9) from the dividend, add it to 71, then carry on: 719 / 815

On to step 3:
If we divide 719 by 815, we get 0 and a remainder of 719.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 719, we get 719.
Take the next digit (5) from the dividend and append it to 719, then repeat: 7195 / 815

Let's proceed to step 4:
When dividing 7195 by 815, we get 8 with a remainder of 675.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 6520 from 7195 leaves us with 675.
Take the next digit (4) from the dividend and append it to 675, then repeat: 6754 / 815

On to step 5:
6754 divided by 815 is 8 with a remainder of 234.
Use 8 as the next digit of our solution. 
Result so far: 88.0
If we subtract 6520 from 6754, we get 234.
Grab the next digit (9) from the dividend, add it to 234, then carry on: 2349 / 815

Going ahead to step 6:
815 can be fit into 2349 2 times, resulting in a remainder of 719.
The number 2 becomes the next digit in our result. 
Result so far: 882.0
If we take 1630 away from 2349, we end up with 719.
Take the next digit (1) from the dividend and append it to 719, then repeat: 7191 / 815

Going ahead to step 7:
When dividing 7191 by 815, we get 8 with a remainder of 671.
The number 8 becomes the next digit in our result. 
Result so far: 8828.0
Subtracting 6520 from 7191 leaves us with 671.
Append the next digit (2) from the dividend to 671 and continue with: 6712 / 815

Advancing to step 8:
If we divide 6712 by 815, we get 8 and a remainder of 192.
Record the quotient 8 as the next digit in the result. 
Result so far: 88288.0
Subtract 6520 from 6712 to get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Advancing to step 9:
815 can be fit into 1920 2 times, resulting in a remainder of 290.
Put 2 as the next digit of the answer. 
Result so far: 88288.2
Subtracting 1630 from 1920 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

On to step 10:
When dividing 2900 by 815, we get 3 with a remainder of 455.
The number 3 becomes the next digit in our result. 
Result so far: 88288.23
Subtracting 2445 from 2900 leaves us with 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Step 11:
The number 815 fits into 4550 5 times, leaving a remainder of 475.
Record the quotient 5 as the next digit in the result. 
Result so far: 88288.235
If we take 4075 away from 4550, we end up with 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Going ahead to step 12:
815 goes into 4750 5 times with a remainder of 675.
Put 5 as the next digit of the answer. 
Result so far: 88288.2355
If we subtract 4075 from 4750, we get 675.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6750, and continue the process.

After the division, we end up with 88288.2355 and a remainder of 0.00675.