We look at the division of 661654 by 21 
We want to figure out the number of times 661654 can be divided by 21.

Advancing to step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 21

Let's proceed to step 2:
21 goes into 66 3 times with a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 63 from 66, we get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 21

Step 3:
21 can be fit into 31 1 times, resulting in a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
If we take 21 away from 31, we end up with 10.
Take the next digit (6) from the dividend and append it to 10, then repeat: 106 / 21

On to step 4:
The number 21 fits into 106 5 times, leaving a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 315.0
If we take 105 away from 106, we end up with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 21

Let's proceed to step 5:
The number 21 fits into 15 0 times, leaving a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 3150.0
Subtract 0 from 15 to get 15.
Take the next digit (4) from the dividend and append it to 15, then repeat: 154 / 21

Step 6:
21 can be fit into 154 7 times, resulting in a remainder of 7.
Write down 7 as next digit of the result. 
Result so far: 31507.0
The remainder is 7 after subtracting 147 from 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
70 divided by 21 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 31507.3
If we subtract 63 from 70, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 8:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 31507.33
Subtracting 63 from 70 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

In conclusion, the division gives 31507.33 with a balance of 0.007.