We divide 867864 by 21
Our goal is to divide 867864 by 21.

On to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the 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:
86 divided by 21 is 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 2 after subtracting 84 from 86.
Grab the next digit (7) from the dividend, add it to 2, then carry on: 27 / 21

Step 3:
21 goes into 27 1 times with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Deduct 21 from 27 and we're left with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 21

Step 4:
When dividing 68 by 21, we get 3 with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 413.0
Subtracting 63 from 68 leaves us with 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 21

Step 5:
21 goes into 56 2 times with a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 4132.0
If we take 42 away from 56, we end up with 14.
Grab the next digit (4) from the dividend, add it to 14, then carry on: 144 / 21

Advancing to step 6:
21 can be fit into 144 6 times, resulting in a remainder of 18.
Record the quotient 6 as the next digit in the result. 
Result so far: 41326.0
Deduct 126 from 144 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 41326.8
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 41326.85
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
When dividing 150 by 21, we get 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 41326.857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 10:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 41326.8571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
If we divide 90 by 21, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 41326.85714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 12:
60 divided by 21 is 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 41326.857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 13:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 41326.8571428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
When dividing 120 by 21, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 41326.85714285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

After the division, we end up with 41326.85714285 and a remainder of 1.5e-08.