Let's divide 858250 by 21
Our goal is to divide 858250 by 21.

Step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 21

Let's proceed to step 2:
If we divide 85 by 21, we get 4 and a remainder of 1.
The next digit of our result is 4. 
Result so far: 4.0
If we take 84 away from 85, we end up with 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 21

Advancing to step 3:
21 goes into 18 0 times with a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Deduct 0 from 18 and we're left with 18.
Append the next digit (2) from the dividend to 18 and continue with: 182 / 21

Let's proceed to step 4:
If we divide 182 by 21, we get 8 and a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 408.0
If we take 168 away from 182, we end up with 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 21

Step 5:
145 divided by 21 is 6 with a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 4086.0
If we take 126 away from 145, we end up with 19.
Take the next digit (0) from the dividend and append it to 19, then repeat: 190 / 21

Moving on to step 6:
The number 21 fits into 190 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 40869.0
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 40869.0
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 40869.04
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 9:
When dividing 160 by 21, we get 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 40869.047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 10:
When dividing 130 by 21, we get 6 with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 40869.0476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
When dividing 40 by 21, we get 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 40869.04761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 12:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 40869.047619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 13:
10 divided by 21 is 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 40869.047619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 14:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 40869.04761904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The quotient of the division is 40869.04761904, and the remainder is 1.6e-08.