Let's divide 12551645 by 858
We want to divide 12551645 by 858.

Step 1:
The number 858 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 858

Advancing to step 2:
The number 858 fits into 12 0 times, leaving a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (5) of the dividend behind the 12 and repeat the process: 125 / 858

Going ahead to step 3:
If we divide 125 by 858, we get 0 and a remainder of 125.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 125 after subtracting 0 from 125.
Append the next digit (5) from the dividend to 125 and continue with: 1255 / 858

On to step 4:
1255 divided by 858 is 1 with a remainder of 397.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 858 away from 1255, we end up with 397.
Include the next digit (1) from the dividend after 397, then repeat: 3971 / 858

Step 5:
858 goes into 3971 4 times with a remainder of 539.
Write down 4 as next digit of the result. 
Result so far: 14.0
Subtract 3432 from 3971 to get 539.
Grab the next digit (6) from the dividend, add it to 539, then carry on: 5396 / 858

Going ahead to step 6:
858 can be fit into 5396 6 times, resulting in a remainder of 248.
Put 6 as the next digit of the answer. 
Result so far: 146.0
If we take 5148 away from 5396, we end up with 248.
Bring next digit (4) of the dividend behind the 248 and repeat the process: 2484 / 858

Let's proceed to step 7:
858 can be fit into 2484 2 times, resulting in a remainder of 768.
Use 2 as the next digit of our solution. 
Result so far: 1462.0
The remainder is 768 after subtracting 1716 from 2484.
Fetch the next digit (5) from the dividend, attach it to 768 and continue: 7685 / 858

Moving on to step 8:
858 can be fit into 7685 8 times, resulting in a remainder of 821.
Write down 8 as next digit of the result. 
Result so far: 14628.0
Subtract 6864 from 7685 to get 821.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8210, and continue the process.

Advancing to step 9:
If we divide 8210 by 858, we get 9 and a remainder of 488.
Use 9 as the next digit of our solution. 
Result so far: 14628.9
If we take 7722 away from 8210, we end up with 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Advancing to step 10:
When dividing 4880 by 858, we get 5 with a remainder of 590.
The number 5 becomes the next digit in our result. 
Result so far: 14628.95
If we take 4290 away from 4880, we end up with 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

Step 11:
If we divide 5900 by 858, we get 6 and a remainder of 752.
The number 6 becomes the next digit in our result. 
Result so far: 14628.956
The remainder is 752 after subtracting 5148 from 5900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7520, and continue the process.

Step 12:
The number 858 fits into 7520 8 times, leaving a remainder of 656.
The next digit of our result is 8. 
Result so far: 14628.9568
If we subtract 6864 from 7520, we get 656.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6560, and continue the process.

Step 13:
858 can be fit into 6560 7 times, resulting in a remainder of 554.
Put 7 as the next digit of the answer. 
Result so far: 14628.95687
If we subtract 6006 from 6560, we get 554.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

Let's proceed to step 14:
5540 divided by 858 is 6 with a remainder of 392.
Write down 6 as next digit of the result. 
Result so far: 14628.956876
If we subtract 5148 from 5540, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Going ahead to step 15:
858 can be fit into 3920 4 times, resulting in a remainder of 488.
The number 4 becomes the next digit in our result. 
Result so far: 14628.9568764
Deduct 3432 from 3920 and we're left with 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Moving on to step 16:
When dividing 4880 by 858, we get 5 with a remainder of 590.
Use 5 as the next digit of our solution. 
Result so far: 14628.95687645
Subtracting 4290 from 4880 leaves us with 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

After the division, we end up with 14628.95687645 and a remainder of 5.9e-07.