We're dividing 309021 by 57 
We want to figure out the number of times 309021 can be divided by 57.

Step 1:
When dividing 3 by 57, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 57

Step 2:
57 goes into 30 0 times with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Bring next digit (9) of the dividend behind the 30 and repeat the process: 309 / 57

Moving on to step 3:
57 can be fit into 309 5 times, resulting in a remainder of 24.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtracting 285 from 309 leaves us with 24.
Include the next digit (0) from the dividend after 24, then repeat: 240 / 57

Step 4:
The number 57 fits into 240 4 times, leaving a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 54.0
The remainder is 12 after subtracting 228 from 240.
Bring next digit (2) of the dividend behind the 12 and repeat the process: 122 / 57

Step 5:
57 can be fit into 122 2 times, resulting in a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 542.0
Subtracting 114 from 122 leaves us with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 57

On to step 6:
57 goes into 81 1 times with a remainder of 24.
Use 1 as the next digit of our solution. 
Result so far: 5421.0
Deduct 57 from 81 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.

Let's proceed to step 7:
240 divided by 57 is 4 with a remainder of 12.
The next digit of our result is 4. 
Result so far: 5421.4
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.

Step 8:
57 can be fit into 120 2 times, resulting in a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 5421.42
Deduct 114 from 120 and we're left 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.

On to step 9:
57 goes into 60 1 times with a remainder of 3.
The next digit of our result is 1. 
Result so far: 5421.421
Subtracting 57 from 60 leaves us 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 10:
When dividing 30 by 57, we get 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 5421.421
Deduct 0 from 30 and we're left 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.

Step 11:
57 goes into 300 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 5421.42105
If we subtract 285 from 300, we 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 12:
The number 57 fits into 150 2 times, leaving a remainder of 36.
The next digit of our result is 2. 
Result so far: 5421.421052
The remainder is 36 after subtracting 114 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 13:
When dividing 360 by 57, we get 6 with a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 5421.4210526
Subtract 342 from 360 to 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.

Advancing to step 14:
The number 57 fits into 180 3 times, leaving a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 5421.42105263
Subtract 171 from 180 to 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.

After the division, we end up with 5421.42105263 and a remainder of 9e-09.