25140285 ÷ 820 
We're looking to find how many times 820 goes into 25140285.

Advancing to step 1:
The number 820 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
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 / 820

Moving on to step 2:
25 divided by 820 is 0 with a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 25, we end up with 25.
Take the next digit (1) from the dividend and append it to 25, then repeat: 251 / 820

Step 3:
If we divide 251 by 820, we get 0 and a remainder of 251.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 251 and we're left with 251.
Bring next digit (4) of the dividend behind the 251 and repeat the process: 2514 / 820

On to step 4:
2514 divided by 820 is 3 with a remainder of 54.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 2460 from 2514, we get 54.
Bring next digit (0) of the dividend behind the 54 and repeat the process: 540 / 820

Going ahead to step 5:
The number 820 fits into 540 0 times, leaving a remainder of 540.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
If we take 0 away from 540, we end up with 540.
Grab the next digit (2) from the dividend, add it to 540, then carry on: 5402 / 820

Let's proceed to step 6:
When dividing 5402 by 820, we get 6 with a remainder of 482.
The next digit of our result is 6. 
Result so far: 306.0
Subtract 4920 from 5402 to get 482.
Fetch the next digit (8) from the dividend, attach it to 482 and continue: 4828 / 820

Step 7:
4828 divided by 820 is 5 with a remainder of 728.
Put 5 as the next digit of the answer. 
Result so far: 3065.0
Subtracting 4100 from 4828 leaves us with 728.
Fetch the next digit (5) from the dividend, attach it to 728 and continue: 7285 / 820

Advancing to step 8:
If we divide 7285 by 820, we get 8 and a remainder of 725.
Record the quotient 8 as the next digit in the result. 
Result so far: 30658.0
Subtract 6560 from 7285 to get 725.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7250, and continue the process.

Step 9:
820 can be fit into 7250 8 times, resulting in a remainder of 690.
Write down 8 as next digit of the result. 
Result so far: 30658.8
If we subtract 6560 from 7250, we get 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6900, and continue the process.

Going ahead to step 10:
When dividing 6900 by 820, we get 8 with a remainder of 340.
The number 8 becomes the next digit in our result. 
Result so far: 30658.88
Subtract 6560 from 6900 to get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Our division results in 30658.88 with a remaining 0.34.