Let's divide 861751 by 21
Our goal is to divide 861751 by 21.

Advancing to step 1:
8 divided by 21 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 21

Moving on to step 2:
The number 21 fits into 86 4 times, leaving a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 84 away from 86, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 21

On to step 3:
21 goes into 21 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Subtract 21 from 21 to get 0.
Fetch the next digit (7) from the dividend, attach it to 0 and continue: 7 / 21

On to step 4:
21 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 410.0
If we take 0 away from 7, we end up with 7.
Append the next digit (5) from the dividend to 7 and continue with: 75 / 21

On to step 5:
If we divide 75 by 21, we get 3 and a remainder of 12.
The next digit of our result is 3. 
Result so far: 4103.0
Deduct 63 from 75 and we're left with 12.
Fetch the next digit (1) from the dividend, attach it to 12 and continue: 121 / 21

Step 6:
The number 21 fits into 121 5 times, leaving a remainder of 16.
Use 5 as the next digit of our solution. 
Result so far: 41035.0
If we take 105 away from 121, we end up 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.

Going ahead to step 7:
160 divided by 21 is 7 with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 41035.7
If we subtract 147 from 160, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 8:
130 divided by 21 is 6 with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 41035.76
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
When dividing 40 by 21, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 41035.761
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 10:
21 goes into 190 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 41035.7619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 11:
When dividing 10 by 21, we get 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 41035.7619
Subtract 0 from 10 to 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.

Step 12:
When dividing 100 by 21, we get 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 41035.761904
If we subtract 84 from 100, we 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.

On to step 13:
160 divided by 21 is 7 with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 41035.7619047
If we take 147 away from 160, we end up 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.

On to step 14:
If we divide 130 by 21, we get 6 and a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 41035.76190476
If we take 126 away from 130, we end up 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.

The quotient of the division is 41035.76190476, and the remainder is 4e-09.