We're dividing 71520566 by 398 
The aim is to understand the frequency of 398 in 71520566.

Going ahead to step 1:
7 divided by 398 is 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 398

Moving on to step 2:
71 divided by 398 is 0 with a remainder of 71.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 71 after subtracting 0 from 71.
Append the next digit (5) from the dividend to 71 and continue with: 715 / 398

Going ahead to step 3:
398 goes into 715 1 times with a remainder of 317.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 398 from 715, we get 317.
Take the next digit (2) from the dividend and append it to 317, then repeat: 3172 / 398

Let's proceed to step 4:
The number 398 fits into 3172 7 times, leaving a remainder of 386.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Subtracting 2786 from 3172 leaves us with 386.
Include the next digit (0) from the dividend after 386, then repeat: 3860 / 398

Moving on to step 5:
3860 divided by 398 is 9 with a remainder of 278.
The next digit of our result is 9. 
Result so far: 179.0
Deduct 3582 from 3860 and we're left with 278.
Fetch the next digit (5) from the dividend, attach it to 278 and continue: 2785 / 398

Moving on to step 6:
2785 divided by 398 is 6 with a remainder of 397.
The next digit of our result is 6. 
Result so far: 1796.0
Deduct 2388 from 2785 and we're left with 397.
Include the next digit (6) from the dividend after 397, then repeat: 3976 / 398

Going ahead to step 7:
If we divide 3976 by 398, we get 9 and a remainder of 394.
The next digit of our result is 9. 
Result so far: 17969.0
Deduct 3582 from 3976 and we're left with 394.
Grab the next digit (6) from the dividend, add it to 394, then carry on: 3946 / 398

Let's proceed to step 8:
The number 398 fits into 3946 9 times, leaving a remainder of 364.
The number 9 becomes the next digit in our result. 
Result so far: 179699.0
Deduct 3582 from 3946 and we're left 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.

Step 9:
When dividing 3640 by 398, we get 9 with a remainder of 58.
Record the quotient 9 as the next digit in the result. 
Result so far: 179699.9
Deduct 3582 from 3640 and we're left 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.

Advancing to step 10:
The number 398 fits into 580 1 times, leaving a remainder of 182.
Put 1 as the next digit of the answer. 
Result so far: 179699.91
If we subtract 398 from 580, we 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 11:
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: 179699.914
Subtract 1592 from 1820 to 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.

Advancing to step 12:
When dividing 2280 by 398, we get 5 with a remainder of 290.
The next digit of our result is 5. 
Result so far: 179699.9145
Subtract 1990 from 2280 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

On to step 13:
398 can be fit into 2900 7 times, resulting in a remainder of 114.
Use 7 as the next digit of our solution. 
Result so far: 179699.91457
Subtracting 2786 from 2900 leaves us with 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Let's proceed to step 14:
398 goes into 1140 2 times with a remainder of 344.
The number 2 becomes the next digit in our result. 
Result so far: 179699.914572
If we take 796 away from 1140, we end up with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Advancing to step 15:
When dividing 3440 by 398, we get 8 with a remainder of 256.
Put 8 as the next digit of the answer. 
Result so far: 179699.9145728
If we take 3184 away from 3440, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Advancing to step 16:
If we divide 2560 by 398, we get 6 and a remainder of 172.
Record the quotient 6 as the next digit in the result. 
Result so far: 179699.91457286
If we take 2388 away from 2560, we end up with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Our division results in 179699.91457286 with a remaining 1.72e-07.