Let's divide 21559081 by 858
We're looking to find how many times 858 goes into 21559081.

On to step 1:
858 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 858

Going ahead to step 2:
If we divide 21 by 858, we get 0 and a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 858

Advancing to step 3:
215 divided by 858 is 0 with a remainder of 215.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 215, we end up with 215.
Fetch the next digit (5) from the dividend, attach it to 215 and continue: 2155 / 858

On to step 4:
858 can be fit into 2155 2 times, resulting in a remainder of 439.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 1716 away from 2155, we end up with 439.
Take the next digit (9) from the dividend and append it to 439, then repeat: 4399 / 858

Step 5:
When dividing 4399 by 858, we get 5 with a remainder of 109.
The next digit of our result is 5. 
Result so far: 25.0
If we take 4290 away from 4399, we end up with 109.
Grab the next digit (0) from the dividend, add it to 109, then carry on: 1090 / 858

Going ahead to step 6:
The number 858 fits into 1090 1 times, leaving a remainder of 232.
Write down 1 as next digit of the result. 
Result so far: 251.0
Subtracting 858 from 1090 leaves us with 232.
Take the next digit (8) from the dividend and append it to 232, then repeat: 2328 / 858

Advancing to step 7:
2328 divided by 858 is 2 with a remainder of 612.
Use 2 as the next digit of our solution. 
Result so far: 2512.0
Subtract 1716 from 2328 to get 612.
Append the next digit (1) from the dividend to 612 and continue with: 6121 / 858

Going ahead to step 8:
6121 divided by 858 is 7 with a remainder of 115.
Write down 7 as next digit of the result. 
Result so far: 25127.0
The remainder is 115 after subtracting 6006 from 6121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Advancing to step 9:
If we divide 1150 by 858, we get 1 and a remainder of 292.
The number 1 becomes the next digit in our result. 
Result so far: 25127.1
The remainder is 292 after subtracting 858 from 1150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Let's proceed to step 10:
If we divide 2920 by 858, we get 3 and a remainder of 346.
The next digit of our result is 3. 
Result so far: 25127.13
If we subtract 2574 from 2920, we get 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Going ahead to step 11:
3460 divided by 858 is 4 with a remainder of 28.
Record the quotient 4 as the next digit in the result. 
Result so far: 25127.134
If we take 3432 away from 3460, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 12:
The number 858 fits into 280 0 times, leaving a remainder of 280.
The next digit of our result is 0. 
Result so far: 25127.134
If we subtract 0 from 280, we get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Advancing to step 13:
2800 divided by 858 is 3 with a remainder of 226.
Put 3 as the next digit of the answer. 
Result so far: 25127.13403
If we take 2574 away from 2800, we end up with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Advancing to step 14:
858 goes into 2260 2 times with a remainder of 544.
Record the quotient 2 as the next digit in the result. 
Result so far: 25127.134032
If we subtract 1716 from 2260, we get 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Going ahead to step 15:
If we divide 5440 by 858, we get 6 and a remainder of 292.
The next digit of our result is 6. 
Result so far: 25127.1340326
Deduct 5148 from 5440 and we're left with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Step 16:
When dividing 2920 by 858, we get 3 with a remainder of 346.
Use 3 as the next digit of our solution. 
Result so far: 25127.13403263
Deduct 2574 from 2920 and we're left with 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

In conclusion, the division gives 25127.13403263 with a balance of 3.46e-07.