9543211 ÷ 171 
The aim is to understand the frequency of 171 in 9543211.

Going ahead to step 1:
When dividing 9 by 171, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (5) from the dividend to 9 and continue with: 95 / 171

Moving on to step 2:
171 can be fit into 95 0 times, resulting in a remainder of 95.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 95 and we're left with 95.
Include the next digit (4) from the dividend after 95, then repeat: 954 / 171

Advancing to step 3:
When dividing 954 by 171, we get 5 with a remainder of 99.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 99 after subtracting 855 from 954.
Append the next digit (3) from the dividend to 99 and continue with: 993 / 171

Advancing to step 4:
When dividing 993 by 171, we get 5 with a remainder of 138.
Use 5 as the next digit of our solution. 
Result so far: 55.0
The remainder is 138 after subtracting 855 from 993.
Take the next digit (2) from the dividend and append it to 138, then repeat: 1382 / 171

Let's proceed to step 5:
171 goes into 1382 8 times with a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 558.0
Deduct 1368 from 1382 and we're left with 14.
Take the next digit (1) from the dividend and append it to 14, then repeat: 141 / 171

Moving on to step 6:
171 can be fit into 141 0 times, resulting in a remainder of 141.
Put 0 as the next digit of the answer. 
Result so far: 5580.0
If we subtract 0 from 141, we get 141.
Append the next digit (1) from the dividend to 141 and continue with: 1411 / 171

Moving on to step 7:
When dividing 1411 by 171, we get 8 with a remainder of 43.
Use 8 as the next digit of our solution. 
Result so far: 55808.0
If we subtract 1368 from 1411, we 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.

On to step 8:
If we divide 430 by 171, we get 2 and a remainder of 88.
Record the quotient 2 as the next digit in the result. 
Result so far: 55808.2
If we take 342 away from 430, we end up with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 9:
171 can be fit into 880 5 times, resulting in a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 55808.25
If we take 855 away from 880, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 10:
The number 171 fits into 250 1 times, leaving a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 55808.251
Deduct 171 from 250 and we're left 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.

Advancing to step 11:
When dividing 790 by 171, we get 4 with a remainder of 106.
Put 4 as the next digit of the answer. 
Result so far: 55808.2514
If we take 684 away from 790, we end up with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Moving on to step 12:
If we divide 1060 by 171, we get 6 and a remainder of 34.
The next digit of our result is 6. 
Result so far: 55808.25146
If we take 1026 away from 1060, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 13:
The number 171 fits into 340 1 times, leaving a remainder of 169.
Record the quotient 1 as the next digit in the result. 
Result so far: 55808.251461
Subtracting 171 from 340 leaves us with 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Going ahead to step 14:
If we divide 1690 by 171, we get 9 and a remainder of 151.
Write down 9 as next digit of the result. 
Result so far: 55808.2514619
Subtracting 1539 from 1690 leaves us with 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Moving on to step 15:
When dividing 1510 by 171, we get 8 with a remainder of 142.
The number 8 becomes the next digit in our result. 
Result so far: 55808.25146198
If we subtract 1368 from 1510, we get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

The quotient of the division is 55808.25146198, and the remainder is 1.42e-07.