Let's divide 901800 by 57
The aim is to understand the frequency of 57 in 901800.

On to step 1:
The number 57 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 57

On to step 2:
90 divided by 57 is 1 with a remainder of 33.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 57 from 90 leaves us with 33.
Fetch the next digit (1) from the dividend, attach it to 33 and continue: 331 / 57

On to step 3:
57 goes into 331 5 times with a remainder of 46.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtracting 285 from 331 leaves us with 46.
Append the next digit (8) from the dividend to 46 and continue with: 468 / 57

On to step 4:
57 can be fit into 468 8 times, resulting in a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 158.0
Deduct 456 from 468 and we're left with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 57

Going ahead to step 5:
If we divide 120 by 57, we get 2 and a remainder of 6.
The next digit of our result is 2. 
Result so far: 1582.0
Subtract 114 from 120 to get 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 57

Going ahead to step 6:
60 divided by 57 is 1 with a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 15821.0
Deduct 57 from 60 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
If we divide 30 by 57, we get 0 and a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 15821.0
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
When dividing 300 by 57, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 15821.05
The remainder is 15 after subtracting 285 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 9:
If we divide 150 by 57, we get 2 and a remainder of 36.
The next digit of our result is 2. 
Result so far: 15821.052
Subtracting 114 from 150 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 10:
360 divided by 57 is 6 with a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 15821.0526
If we subtract 342 from 360, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 11:
57 can be fit into 180 3 times, resulting in a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 15821.05263
If we subtract 171 from 180, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 12:
57 goes into 90 1 times with a remainder of 33.
The number 1 becomes the next digit in our result. 
Result so far: 15821.052631
The remainder is 33 after subtracting 57 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Step 13:
57 can be fit into 330 5 times, resulting in a remainder of 45.
The next digit of our result is 5. 
Result so far: 15821.0526315
Subtract 285 from 330 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 14:
If we divide 450 by 57, we get 7 and a remainder of 51.
Use 7 as the next digit of our solution. 
Result so far: 15821.05263157
Subtract 399 from 450 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

The final result is 15821.05263157 with a remainder of 5.1e-08.