We divide 658542 by 21
We want to figure out the number of times 658542 can be divided by 21.

Advancing to step 1:
6 divided by 21 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 21

Moving on to step 2:
When dividing 65 by 21, we get 3 with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 2 after subtracting 63 from 65.
Take the next digit (8) from the dividend and append it to 2, then repeat: 28 / 21

Going ahead to step 3:
21 goes into 28 1 times with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 31.0
Subtract 21 from 28 to get 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 21

On to step 4:
21 can be fit into 75 3 times, resulting in a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 313.0
Subtract 63 from 75 to get 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 21

Let's proceed to step 5:
When dividing 124 by 21, we get 5 with a remainder of 19.
The number 5 becomes the next digit in our result. 
Result so far: 3135.0
If we take 105 away from 124, we end up with 19.
Take the next digit (2) from the dividend and append it to 19, then repeat: 192 / 21

Step 6:
When dividing 192 by 21, we get 9 with a remainder of 3.
Write down 9 as next digit of the result. 
Result so far: 31359.0
Deduct 189 from 192 and we're left 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.

Let's proceed to step 7:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 31359.1
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.

Let's proceed to step 8:
When dividing 90 by 21, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 31359.14
Subtract 84 from 90 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.

On to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 31359.142
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.

Let's proceed to step 10:
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: 31359.1428
Deduct 168 from 180 and we're left 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.

Moving on to step 11:
When dividing 120 by 21, we get 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 31359.14285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 12:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 31359.142857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 13:
When dividing 30 by 21, we get 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 31359.1428571
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.

Moving on to step 14:
If we divide 90 by 21, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 31359.14285714
Subtract 84 from 90 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.

Our division results in 31359.14285714 with a remaining 6e-09.