391857 ÷ 57 
We're looking to find how many times 57 goes into 391857.

Step 1:
57 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 57

Going ahead to step 2:
57 can be fit into 39 0 times, resulting in a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Bring next digit (1) of the dividend behind the 39 and repeat the process: 391 / 57

On to step 3:
The number 57 fits into 391 6 times, leaving a remainder of 49.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtracting 342 from 391 leaves us with 49.
Fetch the next digit (8) from the dividend, attach it to 49 and continue: 498 / 57

Step 4:
If we divide 498 by 57, we get 8 and a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 68.0
If we subtract 456 from 498, we get 42.
Take the next digit (5) from the dividend and append it to 42, then repeat: 425 / 57

Step 5:
If we divide 425 by 57, we get 7 and a remainder of 26.
The next digit of our result is 7. 
Result so far: 687.0
If we take 399 away from 425, we end up with 26.
Fetch the next digit (7) from the dividend, attach it to 26 and continue: 267 / 57

Advancing to step 6:
If we divide 267 by 57, we get 4 and a remainder of 39.
Use 4 as the next digit of our solution. 
Result so far: 6874.0
Subtracting 228 from 267 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 7:
57 goes into 390 6 times with a remainder of 48.
The number 6 becomes the next digit in our result. 
Result so far: 6874.6
If we subtract 342 from 390, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 8:
If we divide 480 by 57, we get 8 and a remainder of 24.
Write down 8 as next digit of the result. 
Result so far: 6874.68
Deduct 456 from 480 and we're left 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.

Going ahead to step 9:
240 divided by 57 is 4 with a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 6874.684
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.

Moving on to step 10:
When dividing 120 by 57, we get 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 6874.6842
If we subtract 114 from 120, we get 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.
The number 1 becomes the next digit in our result. 
Result so far: 6874.68421
The remainder is 3 after subtracting 57 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 12:
57 goes into 30 0 times with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 6874.68421
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.

Advancing to step 13:
300 divided by 57 is 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 6874.6842105
Deduct 285 from 300 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 14:
150 divided by 57 is 2 with a remainder of 36.
Put 2 as the next digit of the answer. 
Result so far: 6874.68421052
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.

The final result is 6874.68421052 with a remainder of 3.6e-08.