We divide 661113 by 21
Let's see how many times 21 fits into 661113.

On 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
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 21

Going ahead to step 2:
The number 21 fits into 66 3 times, leaving a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 63 from 66 and we're left with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 21

On to step 3:
When dividing 31 by 21, we get 1 with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 31.0
Subtracting 21 from 31 leaves us with 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 21

Advancing to step 4:
When dividing 101 by 21, we get 4 with a remainder of 17.
The number 4 becomes the next digit in our result. 
Result so far: 314.0
If we subtract 84 from 101, we get 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 21

Advancing to step 5:
171 divided by 21 is 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 3148.0
Deduct 168 from 171 and we're left with 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 21

On to step 6:
21 can be fit into 33 1 times, resulting in a remainder of 12.
The next digit of our result is 1. 
Result so far: 31481.0
If we subtract 21 from 33, we 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.

Step 7:
120 divided by 21 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 31481.5
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.

Let's proceed to step 8:
When dividing 150 by 21, we get 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 31481.57
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.

Going ahead to step 9:
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: 31481.571
Deduct 21 from 30 and we're left 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 goes into 90 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 31481.5714
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.

Advancing to step 11:
If we divide 60 by 21, we get 2 and a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 31481.57142
Subtract 42 from 60 to get 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:
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: 31481.571428
If we take 168 away from 180, we end up 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 13:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 31481.5714285
If we subtract 105 from 120, we 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.

Step 14:
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: 31481.57142857
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.

The final result is 31481.57142857 with a remainder of 3e-09.