237539 divided by 21 
We want to figure out the number of times 237539 can be divided by 21.

Step 1:
21 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 21

On to step 2:
21 goes into 23 1 times with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 2 after subtracting 21 from 23.
Include the next digit (7) from the dividend after 2, then repeat: 27 / 21

Going ahead to step 3:
When dividing 27 by 21, we get 1 with a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 11.0
If we subtract 21 from 27, we get 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 21

Step 4:
When dividing 65 by 21, we get 3 with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 113.0
The remainder is 2 after subtracting 63 from 65.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 21

Step 5:
21 goes into 23 1 times with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1131.0
Deduct 21 from 23 and we're left with 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 21

Going ahead to step 6:
When dividing 29 by 21, we get 1 with a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 11311.0
Subtracting 21 from 29 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 7:
21 goes into 80 3 times with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 11311.3
If we subtract 63 from 80, we get 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 8:
170 divided by 21 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 11311.38
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.

Moving on to step 9:
21 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 11311.38
If we take 0 away from 20, we end up 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.

Advancing to step 10:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 11311.3809
Subtracting 189 from 200 leaves us with 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 11:
110 divided by 21 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 11311.38095
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.

Going ahead to step 12:
If we divide 50 by 21, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 11311.380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 13:
If we divide 80 by 21, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 11311.3809523
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 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 11311.38095238
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.

The quotient of the division is 11311.38095238, and the remainder is 2e-09.