237537 ÷ 21 
Let's see how many times 21 fits into 237537.

Going ahead to step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 21

Step 2:
21 goes into 23 1 times with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 21 from 23 and we're left with 2.
Include the next digit (7) from the dividend after 2, then repeat: 27 / 21

On to step 3:
21 can be fit into 27 1 times, resulting in a remainder of 6.
The next digit of our result is 1. 
Result so far: 11.0
The remainder is 6 after subtracting 21 from 27.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 21

Let's proceed to step 4:
If we divide 65 by 21, we get 3 and a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 113.0
If we subtract 63 from 65, we get 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 21

Step 5:
When dividing 23 by 21, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1131.0
If we take 21 away from 23, we end up with 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 21

Advancing to step 6:
27 divided by 21 is 1 with a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 11311.0
Subtract 21 from 27 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.

Step 7:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The next digit of our result is 2. 
Result so far: 11311.2
Deduct 42 from 60 and we're left 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 8:
When dividing 180 by 21, we get 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 11311.28
Subtracting 168 from 180 leaves us with 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 9:
If we divide 120 by 21, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 11311.285
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.

On to step 10:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 11311.2857
Subtracting 147 from 150 leaves us 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 11:
30 divided by 21 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 11311.28571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 12:
21 goes into 90 4 times with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 11311.285714
If we take 84 away from 90, we end up 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.

Advancing to step 13:
If we divide 60 by 21, we get 2 and a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 11311.2857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 14:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 11311.28571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 11311.28571428 and a remainder of 1.2e-08.