25421230 divided by 858 
Let's see how many times 858 fits into 25421230.

Advancing to step 1:
858 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 858

On to step 2:
When dividing 25 by 858, we get 0 with a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 25, we end up with 25.
Append the next digit (4) from the dividend to 25 and continue with: 254 / 858

Step 3:
When dividing 254 by 858, we get 0 with a remainder of 254.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 254, we get 254.
Grab the next digit (2) from the dividend, add it to 254, then carry on: 2542 / 858

Advancing to step 4:
858 goes into 2542 2 times with a remainder of 826.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 826 after subtracting 1716 from 2542.
Take the next digit (1) from the dividend and append it to 826, then repeat: 8261 / 858

Moving on to step 5:
If we divide 8261 by 858, we get 9 and a remainder of 539.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
If we take 7722 away from 8261, we end up with 539.
Take the next digit (2) from the dividend and append it to 539, then repeat: 5392 / 858

Advancing to step 6:
If we divide 5392 by 858, we get 6 and a remainder of 244.
Write down 6 as next digit of the result. 
Result so far: 296.0
If we subtract 5148 from 5392, we get 244.
Take the next digit (3) from the dividend and append it to 244, then repeat: 2443 / 858

Step 7:
2443 divided by 858 is 2 with a remainder of 727.
The next digit of our result is 2. 
Result so far: 2962.0
Deduct 1716 from 2443 and we're left with 727.
Fetch the next digit (0) from the dividend, attach it to 727 and continue: 7270 / 858

Moving on to step 8:
7270 divided by 858 is 8 with a remainder of 406.
The number 8 becomes the next digit in our result. 
Result so far: 29628.0
If we take 6864 away from 7270, we end up with 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Step 9:
When dividing 4060 by 858, we get 4 with a remainder of 628.
The next digit of our result is 4. 
Result so far: 29628.4
Deduct 3432 from 4060 and we're left with 628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Going ahead to step 10:
6280 divided by 858 is 7 with a remainder of 274.
Put 7 as the next digit of the answer. 
Result so far: 29628.47
If we subtract 6006 from 6280, we get 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Let's proceed to step 11:
When dividing 2740 by 858, we get 3 with a remainder of 166.
Use 3 as the next digit of our solution. 
Result so far: 29628.473
Deduct 2574 from 2740 and we're left with 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Moving on to step 12:
858 can be fit into 1660 1 times, resulting in a remainder of 802.
Write down 1 as next digit of the result. 
Result so far: 29628.4731
Subtracting 858 from 1660 leaves us with 802.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8020, and continue the process.

On to step 13:
858 can be fit into 8020 9 times, resulting in a remainder of 298.
Put 9 as the next digit of the answer. 
Result so far: 29628.47319
The remainder is 298 after subtracting 7722 from 8020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Going ahead to step 14:
2980 divided by 858 is 3 with a remainder of 406.
Record the quotient 3 as the next digit in the result. 
Result so far: 29628.473193
Deduct 2574 from 2980 and we're left with 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Let's proceed to step 15:
858 can be fit into 4060 4 times, resulting in a remainder of 628.
The number 4 becomes the next digit in our result. 
Result so far: 29628.4731934
Subtracting 3432 from 4060 leaves us with 628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Going ahead to step 16:
The number 858 fits into 6280 7 times, leaving a remainder of 274.
Write down 7 as next digit of the result. 
Result so far: 29628.47319347
Subtract 6006 from 6280 to get 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

The final result is 29628.47319347 with a remainder of 2.74e-07.