25559226 ÷ 399 
Our goal is to divide 25559226 by 399.

On to step 1:
399 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 399

Advancing to step 2:
399 goes into 25 0 times with a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Bring next digit (5) of the dividend behind the 25 and repeat the process: 255 / 399

Step 3:
399 goes into 255 0 times with a remainder of 255.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 255 after subtracting 0 from 255.
Include the next digit (5) from the dividend after 255, then repeat: 2555 / 399

Let's proceed to step 4:
2555 divided by 399 is 6 with a remainder of 161.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Deduct 2394 from 2555 and we're left with 161.
Fetch the next digit (9) from the dividend, attach it to 161 and continue: 1619 / 399

Moving on to step 5:
399 can be fit into 1619 4 times, resulting in a remainder of 23.
The number 4 becomes the next digit in our result. 
Result so far: 64.0
Deduct 1596 from 1619 and we're left with 23.
Bring next digit (2) of the dividend behind the 23 and repeat the process: 232 / 399

Going ahead to step 6:
The number 399 fits into 232 0 times, leaving a remainder of 232.
Put 0 as the next digit of the answer. 
Result so far: 640.0
Subtract 0 from 232 to get 232.
Grab the next digit (2) from the dividend, add it to 232, then carry on: 2322 / 399

Moving on to step 7:
If we divide 2322 by 399, we get 5 and a remainder of 327.
The number 5 becomes the next digit in our result. 
Result so far: 6405.0
Deduct 1995 from 2322 and we're left with 327.
Append the next digit (6) from the dividend to 327 and continue with: 3276 / 399

Going ahead to step 8:
399 can be fit into 3276 8 times, resulting in a remainder of 84.
Use 8 as the next digit of our solution. 
Result so far: 64058.0
The remainder is 84 after subtracting 3192 from 3276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 9:
The number 399 fits into 840 2 times, leaving a remainder of 42.
Put 2 as the next digit of the answer. 
Result so far: 64058.2
Deduct 798 from 840 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 10:
When dividing 420 by 399, we get 1 with a remainder of 21.
The next digit of our result is 1. 
Result so far: 64058.21
The remainder is 21 after subtracting 399 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 11:
If we divide 210 by 399, we get 0 and a remainder of 210.
Write down 0 as next digit of the result. 
Result so far: 64058.21
If we subtract 0 from 210, we get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Moving on to step 12:
2100 divided by 399 is 5 with a remainder of 105.
Record the quotient 5 as the next digit in the result. 
Result so far: 64058.2105
Deduct 1995 from 2100 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

On to step 13:
When dividing 1050 by 399, we get 2 with a remainder of 252.
Record the quotient 2 as the next digit in the result. 
Result so far: 64058.21052
Subtracting 798 from 1050 leaves us with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

On to step 14:
399 goes into 2520 6 times with a remainder of 126.
Write down 6 as next digit of the result. 
Result so far: 64058.210526
If we take 2394 away from 2520, we end up with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Let's proceed to step 15:
1260 divided by 399 is 3 with a remainder of 63.
The number 3 becomes the next digit in our result. 
Result so far: 64058.2105263
If we take 1197 away from 1260, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 16:
399 can be fit into 630 1 times, resulting in a remainder of 231.
Record the quotient 1 as the next digit in the result. 
Result so far: 64058.21052631
Subtract 399 from 630 to get 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Our division results in 64058.21052631 with a remaining 2.31e-07.