We're dividing 889386 by 21 
We want to figure out the number of times 889386 can be divided by 21.

On to step 1:
21 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 21

Step 2:
88 divided by 21 is 4 with a remainder of 4.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 84 from 88 to get 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 21

Moving on to step 3:
21 goes into 49 2 times with a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
Subtracting 42 from 49 leaves us with 7.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 21

Step 4:
The number 21 fits into 73 3 times, leaving a remainder of 10.
The next digit of our result is 3. 
Result so far: 423.0
Subtracting 63 from 73 leaves us with 10.
Take the next digit (8) from the dividend and append it to 10, then repeat: 108 / 21

On to step 5:
When dividing 108 by 21, we get 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 4235.0
The remainder is 3 after subtracting 105 from 108.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 21

Moving on to step 6:
21 can be fit into 36 1 times, resulting in a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 42351.0
Subtract 21 from 36 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 42351.7
If we take 147 away from 150, we end up with 3.
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 8:
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: 42351.71
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.

Let's proceed to step 9:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 42351.714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 10:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 42351.7142
If we take 42 away from 60, we end up 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 11:
If we divide 180 by 21, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 42351.71428
If we subtract 168 from 180, we 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 12:
21 goes into 120 5 times with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 42351.714285
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.

Advancing to step 13:
The number 21 fits into 150 7 times, leaving a remainder of 3.
The next digit of our result is 7. 
Result so far: 42351.7142857
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 14:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 42351.71428571
Subtracting 21 from 30 leaves us 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.

The quotient of the division is 42351.71428571, and the remainder is 9e-09.