313146 divided by 21 
Let's see how many times 21 fits into 313146.

Moving on to step 1:
When dividing 3 by 21, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 21

On to step 2:
The number 21 fits into 31 1 times, leaving a remainder of 10.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 21 from 31 to get 10.
Bring next digit (3) of the dividend behind the 10 and repeat the process: 103 / 21

Moving on to step 3:
103 divided by 21 is 4 with a remainder of 19.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Subtracting 84 from 103 leaves us with 19.
Bring next digit (1) of the dividend behind the 19 and repeat the process: 191 / 21

On to step 4:
191 divided by 21 is 9 with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 149.0
If we take 189 away from 191, we end up with 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 21

Advancing to step 5:
The number 21 fits into 24 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 1491.0
Subtracting 21 from 24 leaves us with 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 21

Going ahead to step 6:
21 goes into 36 1 times with a remainder of 15.
The next digit of our result is 1. 
Result so far: 14911.0
If we subtract 21 from 36, 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.

On to step 7:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 14911.7
If we subtract 147 from 150, we get 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 8:
30 divided by 21 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 14911.71
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 9:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 14911.714
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.

Moving on to step 10:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 14911.7142
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 11:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 14911.71428
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 12:
When dividing 120 by 21, we get 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 14911.714285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 13:
21 goes into 150 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 14911.7142857
If we subtract 147 from 150, we get 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 14:
30 divided by 21 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 14911.71428571
If we subtract 21 from 30, we 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.

In conclusion, the division gives 14911.71428571 with a balance of 9e-09.