We look at the division of 19857971 by 452 
The aim is to understand the frequency of 452 in 19857971.

Moving on to step 1:
If we divide 1 by 452, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 452

Going ahead to step 2:
19 divided by 452 is 0 with a remainder of 19.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 19 after subtracting 0 from 19.
Append the next digit (8) from the dividend to 19 and continue with: 198 / 452

Going ahead to step 3:
198 divided by 452 is 0 with a remainder of 198.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 198 and we're left with 198.
Take the next digit (5) from the dividend and append it to 198, then repeat: 1985 / 452

Advancing to step 4:
When dividing 1985 by 452, we get 4 with a remainder of 177.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 1808 from 1985 to get 177.
Bring next digit (7) of the dividend behind the 177 and repeat the process: 1777 / 452

Moving on to step 5:
The number 452 fits into 1777 3 times, leaving a remainder of 421.
The next digit of our result is 3. 
Result so far: 43.0
The remainder is 421 after subtracting 1356 from 1777.
Take the next digit (9) from the dividend and append it to 421, then repeat: 4219 / 452

Advancing to step 6:
The number 452 fits into 4219 9 times, leaving a remainder of 151.
The number 9 becomes the next digit in our result. 
Result so far: 439.0
If we take 4068 away from 4219, we end up with 151.
Fetch the next digit (7) from the dividend, attach it to 151 and continue: 1517 / 452

Advancing to step 7:
452 goes into 1517 3 times with a remainder of 161.
Write down 3 as next digit of the result. 
Result so far: 4393.0
Subtracting 1356 from 1517 leaves us with 161.
Grab the next digit (1) from the dividend, add it to 161, then carry on: 1611 / 452

Step 8:
452 goes into 1611 3 times with a remainder of 255.
The number 3 becomes the next digit in our result. 
Result so far: 43933.0
Subtracting 1356 from 1611 leaves us with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Step 9:
If we divide 2550 by 452, we get 5 and a remainder of 290.
The number 5 becomes the next digit in our result. 
Result so far: 43933.5
Deduct 2260 from 2550 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 10:
The number 452 fits into 2900 6 times, leaving a remainder of 188.
The next digit of our result is 6. 
Result so far: 43933.56
Deduct 2712 from 2900 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Step 11:
1880 divided by 452 is 4 with a remainder of 72.
Record the quotient 4 as the next digit in the result. 
Result so far: 43933.564
Subtracting 1808 from 1880 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 12:
When dividing 720 by 452, we get 1 with a remainder of 268.
The next digit of our result is 1. 
Result so far: 43933.5641
Deduct 452 from 720 and we're left with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Let's proceed to step 13:
452 goes into 2680 5 times with a remainder of 420.
Write down 5 as next digit of the result. 
Result so far: 43933.56415
If we subtract 2260 from 2680, we get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

On to step 14:
452 can be fit into 4200 9 times, resulting in a remainder of 132.
Put 9 as the next digit of the answer. 
Result so far: 43933.564159
If we take 4068 away from 4200, we end up with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Moving on to step 15:
When dividing 1320 by 452, we get 2 with a remainder of 416.
Use 2 as the next digit of our solution. 
Result so far: 43933.5641592
If we subtract 904 from 1320, we get 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Advancing to step 16:
452 can be fit into 4160 9 times, resulting in a remainder of 92.
Write down 9 as next digit of the result. 
Result so far: 43933.56415929
If we subtract 4068 from 4160, we get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

In conclusion, the division gives 43933.56415929 with a balance of 9.2e-08.