We divide 344990 by 21
We want to figure out the number of times 344990 can be divided by 21.

On to step 1:
3 divided by 21 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 21

Moving on to step 2:
When dividing 34 by 21, we get 1 with a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 21 from 34 and we're left with 13.
Bring next digit (4) of the dividend behind the 13 and repeat the process: 134 / 21

Step 3:
When dividing 134 by 21, we get 6 with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we take 126 away from 134, we end up with 8.
Fetch the next digit (9) from the dividend, attach it to 8 and continue: 89 / 21

On to step 4:
When dividing 89 by 21, we get 4 with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 164.0
Subtracting 84 from 89 leaves us with 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 21

Let's proceed to step 5:
The number 21 fits into 59 2 times, leaving a remainder of 17.
Use 2 as the next digit of our solution. 
Result so far: 1642.0
If we subtract 42 from 59, we get 17.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 21

Going ahead to step 6:
21 goes into 170 8 times with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 16428.0
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 16428.0
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
200 divided by 21 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 16428.09
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 9:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 16428.095
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
21 goes into 50 2 times with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 16428.0952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
21 goes into 80 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 16428.09523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 12:
21 goes into 170 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 16428.095238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 13:
21 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 16428.095238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
When dividing 200 by 21, we get 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 16428.09523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

In conclusion, the division gives 16428.09523809 with a balance of 1.1e-08.