290337 ÷ 21 
We want to divide 290337 by 21.

Let's proceed to step 1:
The number 21 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 21

Advancing to step 2:
21 can be fit into 29 1 times, resulting in a remainder of 8.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 21 from 29 and we're left with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 21

Going ahead to step 3:
21 goes into 80 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 13.0
The remainder is 17 after subtracting 63 from 80.
Take the next digit (3) from the dividend and append it to 17, then repeat: 173 / 21

Step 4:
When dividing 173 by 21, we get 8 with a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 138.0
If we subtract 168 from 173, we get 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 21

Step 5:
If we divide 53 by 21, we get 2 and a remainder of 11.
Write down 2 as next digit of the result. 
Result so far: 1382.0
Subtract 42 from 53 to get 11.
Bring next digit (7) of the dividend behind the 11 and repeat the process: 117 / 21

On to step 6:
When dividing 117 by 21, we get 5 with a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 13825.0
Subtract 105 from 117 to 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.

Let's proceed to step 7:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 13825.5
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.

Moving on to step 8:
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: 13825.57
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.

Step 9:
30 divided by 21 is 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 13825.571
If we take 21 away from 30, we end up 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.

Moving on to step 10:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 13825.5714
The remainder is 6 after subtracting 84 from 90.
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 11:
21 goes into 60 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 13825.57142
Subtracting 42 from 60 leaves us with 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:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 13825.571428
Subtracting 168 from 180 leaves us 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.

On to step 13:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 13825.5714285
If we take 105 away from 120, we end up 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.

Advancing to step 14:
150 divided by 21 is 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 13825.57142857
Deduct 147 from 150 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.

Our division results in 13825.57142857 with a remaining 3e-09.