Let's divide 25479580 by 853
We want to figure out the number of times 25479580 can be divided by 853.

On to step 1:
2 divided by 853 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 853

Let's proceed to step 2:
25 divided by 853 is 0 with a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Take the next digit (4) from the dividend and append it to 25, then repeat: 254 / 853

Advancing to step 3:
853 can be fit into 254 0 times, resulting in a remainder of 254.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 254, we end up with 254.
Take the next digit (7) from the dividend and append it to 254, then repeat: 2547 / 853

Advancing to step 4:
The number 853 fits into 2547 2 times, leaving a remainder of 841.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 841 after subtracting 1706 from 2547.
Append the next digit (9) from the dividend to 841 and continue with: 8419 / 853

On to step 5:
When dividing 8419 by 853, we get 9 with a remainder of 742.
Put 9 as the next digit of the answer. 
Result so far: 29.0
The remainder is 742 after subtracting 7677 from 8419.
Bring next digit (5) of the dividend behind the 742 and repeat the process: 7425 / 853

Step 6:
The number 853 fits into 7425 8 times, leaving a remainder of 601.
Record the quotient 8 as the next digit in the result. 
Result so far: 298.0
Subtract 6824 from 7425 to get 601.
Take the next digit (8) from the dividend and append it to 601, then repeat: 6018 / 853

Moving on to step 7:
The number 853 fits into 6018 7 times, leaving a remainder of 47.
Record the quotient 7 as the next digit in the result. 
Result so far: 2987.0
Subtract 5971 from 6018 to get 47.
Grab the next digit (0) from the dividend, add it to 47, then carry on: 470 / 853

On to step 8:
When dividing 470 by 853, we get 0 with a remainder of 470.
Put 0 as the next digit of the answer. 
Result so far: 29870.0
If we subtract 0 from 470, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Step 9:
4700 divided by 853 is 5 with a remainder of 435.
The number 5 becomes the next digit in our result. 
Result so far: 29870.5
If we take 4265 away from 4700, we end up with 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

Advancing to step 10:
853 goes into 4350 5 times with a remainder of 85.
Put 5 as the next digit of the answer. 
Result so far: 29870.55
Subtract 4265 from 4350 to get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

The final outcome is 29870.55, with a leftover of 0.085.