65271638 ÷ 391 
The aim is to understand the frequency of 391 in 65271638.

Advancing to step 1:
The number 391 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 391

Going ahead to step 2:
391 goes into 65 0 times with a remainder of 65.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 65 leaves us with 65.
Bring next digit (2) of the dividend behind the 65 and repeat the process: 652 / 391

On to step 3:
When dividing 652 by 391, we get 1 with a remainder of 261.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 391 from 652 to get 261.
Append the next digit (7) from the dividend to 261 and continue with: 2617 / 391

On to step 4:
If we divide 2617 by 391, we get 6 and a remainder of 271.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtract 2346 from 2617 to get 271.
Fetch the next digit (1) from the dividend, attach it to 271 and continue: 2711 / 391

Advancing to step 5:
The number 391 fits into 2711 6 times, leaving a remainder of 365.
Record the quotient 6 as the next digit in the result. 
Result so far: 166.0
Deduct 2346 from 2711 and we're left with 365.
Include the next digit (6) from the dividend after 365, then repeat: 3656 / 391

Step 6:
391 can be fit into 3656 9 times, resulting in a remainder of 137.
Record the quotient 9 as the next digit in the result. 
Result so far: 1669.0
If we subtract 3519 from 3656, we get 137.
Take the next digit (3) from the dividend and append it to 137, then repeat: 1373 / 391

On to step 7:
When dividing 1373 by 391, we get 3 with a remainder of 200.
Record the quotient 3 as the next digit in the result. 
Result so far: 16693.0
Subtract 1173 from 1373 to get 200.
Take the next digit (8) from the dividend and append it to 200, then repeat: 2008 / 391

Advancing to step 8:
2008 divided by 391 is 5 with a remainder of 53.
Use 5 as the next digit of our solution. 
Result so far: 166935.0
The remainder is 53 after subtracting 1955 from 2008.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 9:
When dividing 530 by 391, we get 1 with a remainder of 139.
Record the quotient 1 as the next digit in the result. 
Result so far: 166935.1
If we take 391 away from 530, we end up with 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Advancing to step 10:
391 can be fit into 1390 3 times, resulting in a remainder of 217.
Write down 3 as next digit of the result. 
Result so far: 166935.13
If we take 1173 away from 1390, we end up with 217.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

Step 11:
If we divide 2170 by 391, we get 5 and a remainder of 215.
Write down 5 as next digit of the result. 
Result so far: 166935.135
Deduct 1955 from 2170 and we're left with 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Step 12:
If we divide 2150 by 391, we get 5 and a remainder of 195.
Write down 5 as next digit of the result. 
Result so far: 166935.1355
If we take 1955 away from 2150, we end up with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

The final result is 166935.1355 with a remainder of 0.00195.