789235 divided by 21 
We want to figure out the number of times 789235 can be divided by 21.

On to step 1:
The number 21 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 21

On to step 2:
When dividing 78 by 21, we get 3 with a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we subtract 63 from 78, we get 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 21

Advancing to step 3:
21 goes into 159 7 times with a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 37.0
Subtracting 147 from 159 leaves us with 12.
Take the next digit (2) from the dividend and append it to 12, then repeat: 122 / 21

Moving on to step 4:
21 can be fit into 122 5 times, resulting in a remainder of 17.
Use 5 as the next digit of our solution. 
Result so far: 375.0
If we take 105 away from 122, we end up with 17.
Include the next digit (3) from the dividend after 17, then repeat: 173 / 21

Let's proceed to step 5:
The number 21 fits into 173 8 times, leaving a remainder of 5.
The next digit of our result is 8. 
Result so far: 3758.0
Subtracting 168 from 173 leaves us with 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 21

Going ahead to step 6:
If we divide 55 by 21, we get 2 and a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 37582.0
If we take 42 away from 55, 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.

Step 7:
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: 37582.6
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 8:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 37582.61
Deduct 21 from 40 and we're left 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.

Step 9:
If we divide 190 by 21, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 37582.619
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.

Step 10:
When dividing 10 by 21, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 37582.619
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 11:
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: 37582.61904
If we take 84 away from 100, 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.

On to step 12:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 37582.619047
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.

Step 13:
21 goes into 130 6 times with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 37582.6190476
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.

On to step 14:
21 goes into 40 1 times with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 37582.61904761
Subtracting 21 from 40 leaves us 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.

Our division results in 37582.61904761 with a remaining 1.9e-08.