Let's divide 251150 by 21
We want to divide 251150 by 21.

On to step 1:
If we divide 2 by 21, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 21

On to step 2:
25 divided by 21 is 1 with a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 21 from 25, we get 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 21

Advancing to step 3:
41 divided by 21 is 1 with a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 11.0
Deduct 21 from 41 and we're left with 20.
Grab the next digit (1) from the dividend, add it to 20, then carry on: 201 / 21

On to step 4:
The number 21 fits into 201 9 times, leaving a remainder of 12.
The next digit of our result is 9. 
Result so far: 119.0
If we subtract 189 from 201, we get 12.
Include the next digit (5) from the dividend after 12, then repeat: 125 / 21

Step 5:
If we divide 125 by 21, we get 5 and a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 1195.0
Deduct 105 from 125 and we're left with 20.
Grab the next digit (0) from the dividend, add it to 20, then carry on: 200 / 21

Let's proceed to step 6:
The number 21 fits into 200 9 times, leaving a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 11959.0
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 11959.5
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 8:
If we divide 50 by 21, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 11959.52
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 9:
If we divide 80 by 21, we get 3 and a remainder of 17.
The next digit of our result is 3. 
Result so far: 11959.523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 10:
When dividing 170 by 21, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 11959.5238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 11:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 11959.5238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 12:
21 goes into 200 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 11959.523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 13:
110 divided by 21 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 11959.5238095
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 14:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 11959.52380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Our division results in 11959.52380952 with a remaining 8e-09.