91140141 ÷ 398 
The aim is to understand the frequency of 398 in 91140141.

Advancing to step 1:
If we divide 9 by 398, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 398

Advancing to step 2:
The number 398 fits into 91 0 times, leaving a remainder of 91.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 91 after subtracting 0 from 91.
Bring next digit (1) of the dividend behind the 91 and repeat the process: 911 / 398

Moving on to step 3:
911 divided by 398 is 2 with a remainder of 115.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 796 from 911 to get 115.
Take the next digit (4) from the dividend and append it to 115, then repeat: 1154 / 398

Going ahead to step 4:
The number 398 fits into 1154 2 times, leaving a remainder of 358.
Use 2 as the next digit of our solution. 
Result so far: 22.0
If we subtract 796 from 1154, we get 358.
Include the next digit (0) from the dividend after 358, then repeat: 3580 / 398

On to step 5:
398 goes into 3580 8 times with a remainder of 396.
Record the quotient 8 as the next digit in the result. 
Result so far: 228.0
The remainder is 396 after subtracting 3184 from 3580.
Grab the next digit (1) from the dividend, add it to 396, then carry on: 3961 / 398

Going ahead to step 6:
3961 divided by 398 is 9 with a remainder of 379.
Use 9 as the next digit of our solution. 
Result so far: 2289.0
Subtract 3582 from 3961 to get 379.
Fetch the next digit (4) from the dividend, attach it to 379 and continue: 3794 / 398

Moving on to step 7:
398 can be fit into 3794 9 times, resulting in a remainder of 212.
The next digit of our result is 9. 
Result so far: 22899.0
The remainder is 212 after subtracting 3582 from 3794.
Append the next digit (1) from the dividend to 212 and continue with: 2121 / 398

Step 8:
If we divide 2121 by 398, we get 5 and a remainder of 131.
Use 5 as the next digit of our solution. 
Result so far: 228995.0
If we take 1990 away from 2121, we end up with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Advancing to step 9:
When dividing 1310 by 398, we get 3 with a remainder of 116.
The next digit of our result is 3. 
Result so far: 228995.3
Subtract 1194 from 1310 to get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Moving on to step 10:
398 can be fit into 1160 2 times, resulting in a remainder of 364.
Write down 2 as next digit of the result. 
Result so far: 228995.32
Subtracting 796 from 1160 leaves us with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Let's proceed to step 11:
398 goes into 3640 9 times with a remainder of 58.
Write down 9 as next digit of the result. 
Result so far: 228995.329
Subtract 3582 from 3640 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 12:
398 can be fit into 580 1 times, resulting in a remainder of 182.
Write down 1 as next digit of the result. 
Result so far: 228995.3291
Subtract 398 from 580 to get 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Step 13:
When dividing 1820 by 398, we get 4 with a remainder of 228.
Record the quotient 4 as the next digit in the result. 
Result so far: 228995.32914
If we subtract 1592 from 1820, we get 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

On to step 14:
398 can be fit into 2280 5 times, resulting in a remainder of 290.
Write down 5 as next digit of the result. 
Result so far: 228995.329145
Deduct 1990 from 2280 and we're left 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.

Step 15:
2900 divided by 398 is 7 with a remainder of 114.
Record the quotient 7 as the next digit in the result. 
Result so far: 228995.3291457
If we subtract 2786 from 2900, we get 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Moving on to step 16:
1140 divided by 398 is 2 with a remainder of 344.
Record the quotient 2 as the next digit in the result. 
Result so far: 228995.32914572
Subtract 796 from 1140 to get 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

After the division, we end up with 228995.32914572 and a remainder of 3.44e-07.