57096663 ÷ 420 
Our goal is to divide 57096663 by 420.

Advancing to step 1:
When dividing 5 by 420, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 420

Let's proceed to step 2:
420 goes into 57 0 times with a remainder of 57.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 57 leaves us with 57.
Bring next digit (0) of the dividend behind the 57 and repeat the process: 570 / 420

Moving on to step 3:
The number 420 fits into 570 1 times, leaving a remainder of 150.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 420 away from 570, we end up with 150.
Take the next digit (9) from the dividend and append it to 150, then repeat: 1509 / 420

Moving on to step 4:
420 can be fit into 1509 3 times, resulting in a remainder of 249.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 1260 from 1509, we get 249.
Bring next digit (6) of the dividend behind the 249 and repeat the process: 2496 / 420

On to step 5:
The number 420 fits into 2496 5 times, leaving a remainder of 396.
Write down 5 as next digit of the result. 
Result so far: 135.0
Subtract 2100 from 2496 to get 396.
Fetch the next digit (6) from the dividend, attach it to 396 and continue: 3966 / 420

On to step 6:
420 can be fit into 3966 9 times, resulting in a remainder of 186.
Use 9 as the next digit of our solution. 
Result so far: 1359.0
Subtracting 3780 from 3966 leaves us with 186.
Fetch the next digit (6) from the dividend, attach it to 186 and continue: 1866 / 420

Let's proceed to step 7:
420 goes into 1866 4 times with a remainder of 186.
Put 4 as the next digit of the answer. 
Result so far: 13594.0
If we take 1680 away from 1866, we end up with 186.
Grab the next digit (3) from the dividend, add it to 186, then carry on: 1863 / 420

Step 8:
420 can be fit into 1863 4 times, resulting in a remainder of 183.
The number 4 becomes the next digit in our result. 
Result so far: 135944.0
Subtracting 1680 from 1863 leaves us with 183.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1830, and continue the process.

Going ahead to step 9:
420 goes into 1830 4 times with a remainder of 150.
The next digit of our result is 4. 
Result so far: 135944.4
The remainder is 150 after subtracting 1680 from 1830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Going ahead to step 10:
If we divide 1500 by 420, we get 3 and a remainder of 240.
The number 3 becomes the next digit in our result. 
Result so far: 135944.43
Subtract 1260 from 1500 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 11:
If we divide 2400 by 420, we get 5 and a remainder of 300.
The next digit of our result is 5. 
Result so far: 135944.435
If we take 2100 away from 2400, we end up with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 12:
The number 420 fits into 3000 7 times, leaving a remainder of 60.
The next digit of our result is 7. 
Result so far: 135944.4357
If we subtract 2940 from 3000, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 13:
420 goes into 600 1 times with a remainder of 180.
Write down 1 as next digit of the result. 
Result so far: 135944.43571
Deduct 420 from 600 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 14:
If we divide 1800 by 420, we get 4 and a remainder of 120.
The next digit of our result is 4. 
Result so far: 135944.435714
The remainder is 120 after subtracting 1680 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 15:
420 goes into 1200 2 times with a remainder of 360.
Use 2 as the next digit of our solution. 
Result so far: 135944.4357142
Deduct 840 from 1200 and we're left with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 16:
The number 420 fits into 3600 8 times, leaving a remainder of 240.
Record the quotient 8 as the next digit in the result. 
Result so far: 135944.43571428
If we take 3360 away from 3600, we end up with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

In conclusion, the division gives 135944.43571428 with a balance of 2.4e-07.