91531574 ÷ 158 
The aim is to understand the frequency of 158 in 91531574.

Advancing to step 1:
158 can be fit into 9 0 times, resulting in a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 158

Going ahead to step 2:
When dividing 91 by 158, we get 0 with a remainder of 91.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 91, we end up with 91.
Grab the next digit (5) from the dividend, add it to 91, then carry on: 915 / 158

Moving on to step 3:
158 can be fit into 915 5 times, resulting in a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 5.0
The remainder is 125 after subtracting 790 from 915.
Bring next digit (3) of the dividend behind the 125 and repeat the process: 1253 / 158

Moving on to step 4:
1253 divided by 158 is 7 with a remainder of 147.
Write down 7 as next digit of the result. 
Result so far: 57.0
Deduct 1106 from 1253 and we're left with 147.
Append the next digit (1) from the dividend to 147 and continue with: 1471 / 158

Going ahead to step 5:
1471 divided by 158 is 9 with a remainder of 49.
Record the quotient 9 as the next digit in the result. 
Result so far: 579.0
If we take 1422 away from 1471, we end up with 49.
Bring next digit (5) of the dividend behind the 49 and repeat the process: 495 / 158

Moving on to step 6:
If we divide 495 by 158, we get 3 and a remainder of 21.
Record the quotient 3 as the next digit in the result. 
Result so far: 5793.0
Deduct 474 from 495 and we're left with 21.
Grab the next digit (7) from the dividend, add it to 21, then carry on: 217 / 158

Let's proceed to step 7:
When dividing 217 by 158, we get 1 with a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 57931.0
Subtract 158 from 217 to get 59.
Grab the next digit (4) from the dividend, add it to 59, then carry on: 594 / 158

Going ahead to step 8:
158 goes into 594 3 times with a remainder of 120.
The number 3 becomes the next digit in our result. 
Result so far: 579313.0
Deduct 474 from 594 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 9:
1200 divided by 158 is 7 with a remainder of 94.
The next digit of our result is 7. 
Result so far: 579313.7
Subtract 1106 from 1200 to get 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Let's proceed to step 10:
158 goes into 940 5 times with a remainder of 150.
The next digit of our result is 5. 
Result so far: 579313.75
Deduct 790 from 940 and we're left with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Going ahead to step 11:
If we divide 1500 by 158, we get 9 and a remainder of 78.
Record the quotient 9 as the next digit in the result. 
Result so far: 579313.759
Subtracting 1422 from 1500 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 12:
If we divide 780 by 158, we get 4 and a remainder of 148.
Use 4 as the next digit of our solution. 
Result so far: 579313.7594
Subtracting 632 from 780 leaves us with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Step 13:
158 can be fit into 1480 9 times, resulting in a remainder of 58.
The number 9 becomes the next digit in our result. 
Result so far: 579313.75949
If we take 1422 away from 1480, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 14:
The number 158 fits into 580 3 times, leaving a remainder of 106.
Put 3 as the next digit of the answer. 
Result so far: 579313.759493
The remainder is 106 after subtracting 474 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Advancing to step 15:
158 goes into 1060 6 times with a remainder of 112.
Put 6 as the next digit of the answer. 
Result so far: 579313.7594936
If we take 948 away from 1060, we end up with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Step 16:
158 goes into 1120 7 times with a remainder of 14.
The next digit of our result is 7. 
Result so far: 579313.75949367
If we take 1106 away from 1120, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 579313.75949367 with a remainder of 1.4e-08.