Let's divide 203573 by 21
We want to figure out the number of times 203573 can be divided by 21.

Going ahead to step 1:
If we divide 2 by 21, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 21

Step 2:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Include the next digit (3) from the dividend after 20, then repeat: 203 / 21

Step 3:
When dividing 203 by 21, we get 9 with a remainder of 14.
Use 9 as the next digit of our solution. 
Result so far: 9.0
The remainder is 14 after subtracting 189 from 203.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 21

On to step 4:
145 divided by 21 is 6 with a remainder of 19.
Record the quotient 6 as the next digit in the result. 
Result so far: 96.0
Subtracting 126 from 145 leaves us with 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 21

On to step 5:
If we divide 197 by 21, we get 9 and a remainder of 8.
Use 9 as the next digit of our solution. 
Result so far: 969.0
The remainder is 8 after subtracting 189 from 197.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 21

Advancing to step 6:
21 goes into 83 3 times with a remainder of 20.
Use 3 as the next digit of our solution. 
Result so far: 9693.0
Subtracting 63 from 83 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 7:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 9693.9
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 8:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 9693.95
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 9:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 9693.952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
80 divided by 21 is 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 9693.9523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 11:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 9693.95238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 12:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 9693.95238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 9693.9523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 14:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 9693.95238095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

In conclusion, the division gives 9693.95238095 with a balance of 5e-09.