We divide 755823 by 21
We want to figure out the number of times 755823 can be divided by 21.

Let's proceed to step 1:
When dividing 7 by 21, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 21

Advancing to step 2:
If we divide 75 by 21, we get 3 and a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 63 from 75 and we're left with 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 21

Advancing to step 3:
21 goes into 125 5 times with a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 35.0
The remainder is 20 after subtracting 105 from 125.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 21

Step 4:
21 can be fit into 208 9 times, resulting in a remainder of 19.
Put 9 as the next digit of the answer. 
Result so far: 359.0
If we subtract 189 from 208, we get 19.
Grab the next digit (2) from the dividend, add it to 19, then carry on: 192 / 21

Advancing to step 5:
21 can be fit into 192 9 times, resulting in a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 3599.0
Subtract 189 from 192 to get 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 21

Going ahead to step 6:
When dividing 33 by 21, we get 1 with a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 35991.0
The remainder is 12 after subtracting 21 from 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 7:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 35991.5
If we take 105 away from 120, we end up 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 8:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 35991.57
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.

Moving on to step 9:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 35991.571
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.

On to step 10:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 35991.5714
Deduct 84 from 90 and we're left 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.

Let's proceed to step 11:
21 goes into 60 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 35991.57142
Subtracting 42 from 60 leaves us 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.

On to step 12:
180 divided by 21 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 35991.571428
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.

Moving on to step 13:
21 goes into 120 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 35991.5714285
The remainder is 15 after subtracting 105 from 120.
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 14:
150 divided by 21 is 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 35991.57142857
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.

Our division results in 35991.57142857 with a remaining 3e-09.