We divide 390660 by 57
The aim is to understand the frequency of 57 in 390660.

On to step 1:
If we divide 3 by 57, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 57

Step 2:
If we divide 39 by 57, we get 0 and a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Include the next digit (0) from the dividend after 39, then repeat: 390 / 57

Moving on to step 3:
When dividing 390 by 57, we get 6 with a remainder of 48.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 342 from 390, we get 48.
Bring next digit (6) of the dividend behind the 48 and repeat the process: 486 / 57

Moving on to step 4:
486 divided by 57 is 8 with a remainder of 30.
Use 8 as the next digit of our solution. 
Result so far: 68.0
The remainder is 30 after subtracting 456 from 486.
Fetch the next digit (6) from the dividend, attach it to 30 and continue: 306 / 57

Step 5:
306 divided by 57 is 5 with a remainder of 21.
Write down 5 as next digit of the result. 
Result so far: 685.0
Subtract 285 from 306 to get 21.
Take the next digit (0) from the dividend and append it to 21, then repeat: 210 / 57

On to step 6:
57 can be fit into 210 3 times, resulting in a remainder of 39.
Put 3 as the next digit of the answer. 
Result so far: 6853.0
Subtract 171 from 210 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 7:
390 divided by 57 is 6 with a remainder of 48.
Put 6 as the next digit of the answer. 
Result so far: 6853.6
Subtracting 342 from 390 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 8:
480 divided by 57 is 8 with a remainder of 24.
The next digit of our result is 8. 
Result so far: 6853.68
Subtracting 456 from 480 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 9:
If we divide 240 by 57, we get 4 and a remainder of 12.
Use 4 as the next digit of our solution. 
Result so far: 6853.684
If we take 228 away from 240, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 10:
If we divide 120 by 57, we get 2 and a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 6853.6842
If we take 114 away from 120, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 11:
When dividing 60 by 57, we get 1 with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 6853.68421
If we take 57 away from 60, we end up 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.

On to step 12:
The number 57 fits into 30 0 times, leaving a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 6853.68421
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.

On to step 13:
The number 57 fits into 300 5 times, leaving a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 6853.6842105
Subtract 285 from 300 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 14:
57 can be fit into 150 2 times, resulting in a remainder of 36.
The next digit of our result is 2. 
Result so far: 6853.68421052
If we subtract 114 from 150, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Our division results in 6853.68421052 with a remaining 3.6e-08.