We look at the division of 53453988 by 171 
The aim is to understand the frequency of 171 in 53453988.

Advancing to step 1:
171 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 171

Advancing to step 2:
When dividing 53 by 171, we get 0 with a remainder of 53.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 53, we end up with 53.
Grab the next digit (4) from the dividend, add it to 53, then carry on: 534 / 171

Advancing to step 3:
534 divided by 171 is 3 with a remainder of 21.
The next digit of our result is 3. 
Result so far: 3.0
If we take 513 away from 534, we end up with 21.
Take the next digit (5) from the dividend and append it to 21, then repeat: 215 / 171

On to step 4:
171 can be fit into 215 1 times, resulting in a remainder of 44.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
If we subtract 171 from 215, we get 44.
Bring next digit (3) of the dividend behind the 44 and repeat the process: 443 / 171

Advancing to step 5:
443 divided by 171 is 2 with a remainder of 101.
Write down 2 as next digit of the result. 
Result so far: 312.0
The remainder is 101 after subtracting 342 from 443.
Grab the next digit (9) from the dividend, add it to 101, then carry on: 1019 / 171

Advancing to step 6:
If we divide 1019 by 171, we get 5 and a remainder of 164.
The number 5 becomes the next digit in our result. 
Result so far: 3125.0
Deduct 855 from 1019 and we're left with 164.
Grab the next digit (8) from the dividend, add it to 164, then carry on: 1648 / 171

Advancing to step 7:
1648 divided by 171 is 9 with a remainder of 109.
Use 9 as the next digit of our solution. 
Result so far: 31259.0
Subtracting 1539 from 1648 leaves us with 109.
Include the next digit (8) from the dividend after 109, then repeat: 1098 / 171

Going ahead to step 8:
1098 divided by 171 is 6 with a remainder of 72.
Record the quotient 6 as the next digit in the result. 
Result so far: 312596.0
Subtract 1026 from 1098 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 9:
720 divided by 171 is 4 with a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 312596.4
Deduct 684 from 720 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 10:
When dividing 360 by 171, we get 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 312596.42
The remainder is 18 after subtracting 342 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 11:
180 divided by 171 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 312596.421
If we subtract 171 from 180, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 12:
171 can be fit into 90 0 times, resulting in a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 312596.421
If we subtract 0 from 90, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 13:
171 goes into 900 5 times with a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 312596.42105
The remainder is 45 after subtracting 855 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 14:
The number 171 fits into 450 2 times, leaving a remainder of 108.
The next digit of our result is 2. 
Result so far: 312596.421052
Subtract 342 from 450 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Moving on to step 15:
The number 171 fits into 1080 6 times, leaving a remainder of 54.
Use 6 as the next digit of our solution. 
Result so far: 312596.4210526
Deduct 1026 from 1080 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 16:
When dividing 540 by 171, we get 3 with a remainder of 27.
Use 3 as the next digit of our solution. 
Result so far: 312596.42105263
Subtract 513 from 540 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The quotient of the division is 312596.42105263, and the remainder is 2.7e-08.