We're dividing 39573021 by 357 
The aim is to understand the frequency of 357 in 39573021.

Advancing to step 1:
357 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 357

Going ahead to step 2:
If we divide 39 by 357, we get 0 and a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Include the next digit (5) from the dividend after 39, then repeat: 395 / 357

Going ahead to step 3:
357 can be fit into 395 1 times, resulting in a remainder of 38.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 357 from 395, we get 38.
Include the next digit (7) from the dividend after 38, then repeat: 387 / 357

Moving on to step 4:
When dividing 387 by 357, we get 1 with a remainder of 30.
Write down 1 as next digit of the result. 
Result so far: 11.0
If we subtract 357 from 387, we get 30.
Take the next digit (3) from the dividend and append it to 30, then repeat: 303 / 357

Moving on to step 5:
If we divide 303 by 357, we get 0 and a remainder of 303.
The next digit of our result is 0. 
Result so far: 110.0
Subtract 0 from 303 to get 303.
Bring next digit (0) of the dividend behind the 303 and repeat the process: 3030 / 357

Moving on to step 6:
If we divide 3030 by 357, we get 8 and a remainder of 174.
Put 8 as the next digit of the answer. 
Result so far: 1108.0
Subtracting 2856 from 3030 leaves us with 174.
Fetch the next digit (2) from the dividend, attach it to 174 and continue: 1742 / 357

Let's proceed to step 7:
1742 divided by 357 is 4 with a remainder of 314.
Record the quotient 4 as the next digit in the result. 
Result so far: 11084.0
Subtracting 1428 from 1742 leaves us with 314.
Grab the next digit (1) from the dividend, add it to 314, then carry on: 3141 / 357

Advancing to step 8:
357 can be fit into 3141 8 times, resulting in a remainder of 285.
The next digit of our result is 8. 
Result so far: 110848.0
Subtracting 2856 from 3141 leaves us with 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

On to step 9:
If we divide 2850 by 357, we get 7 and a remainder of 351.
Use 7 as the next digit of our solution. 
Result so far: 110848.7
Subtract 2499 from 2850 to get 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

On to step 10:
3510 divided by 357 is 9 with a remainder of 297.
Write down 9 as next digit of the result. 
Result so far: 110848.79
The remainder is 297 after subtracting 3213 from 3510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Step 11:
357 can be fit into 2970 8 times, resulting in a remainder of 114.
Put 8 as the next digit of the answer. 
Result so far: 110848.798
Subtract 2856 from 2970 to 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.

Step 12:
If we divide 1140 by 357, we get 3 and a remainder of 69.
Put 3 as the next digit of the answer. 
Result so far: 110848.7983
The remainder is 69 after subtracting 1071 from 1140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 13:
When dividing 690 by 357, we get 1 with a remainder of 333.
Record the quotient 1 as the next digit in the result. 
Result so far: 110848.79831
If we subtract 357 from 690, we get 333.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

Going ahead to step 14:
357 can be fit into 3330 9 times, resulting in a remainder of 117.
Put 9 as the next digit of the answer. 
Result so far: 110848.798319
The remainder is 117 after subtracting 3213 from 3330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Step 15:
If we divide 1170 by 357, we get 3 and a remainder of 99.
Write down 3 as next digit of the result. 
Result so far: 110848.7983193
Subtracting 1071 from 1170 leaves us with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Advancing to step 16:
If we divide 990 by 357, we get 2 and a remainder of 276.
Put 2 as the next digit of the answer. 
Result so far: 110848.79831932
Deduct 714 from 990 and we're left with 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

The quotient of the division is 110848.79831932, and the remainder is 2.76e-07.