550959 ÷ 21 
Let's see how many times 21 fits into 550959.

Let's proceed to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 21

Advancing to step 2:
If we divide 55 by 21, we get 2 and a remainder of 13.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 42 from 55 and we're left with 13.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 21

Let's proceed to step 3:
If we divide 130 by 21, we get 6 and a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 26.0
If we take 126 away from 130, we end up with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 21

Advancing to step 4:
If we divide 49 by 21, we get 2 and a remainder of 7.
The next digit of our result is 2. 
Result so far: 262.0
Subtracting 42 from 49 leaves us with 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 21

Let's proceed to step 5:
75 divided by 21 is 3 with a remainder of 12.
Put 3 as the next digit of the answer. 
Result so far: 2623.0
Subtract 63 from 75 to get 12.
Include the next digit (9) from the dividend after 12, then repeat: 129 / 21

Advancing to step 6:
If we divide 129 by 21, we get 6 and a remainder of 3.
The number 6 becomes the next digit in our result. 
Result so far: 26236.0
Subtract 126 from 129 to 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.

Going ahead to step 7:
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: 26236.1
Subtracting 21 from 30 leaves us 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.

Let's proceed to step 8:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 26236.14
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.

Going ahead to step 9:
21 goes into 60 2 times with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 26236.142
If we subtract 42 from 60, we 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.

Step 10:
180 divided by 21 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 26236.1428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 11:
120 divided by 21 is 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 26236.14285
Deduct 105 from 120 and we're left 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 12:
21 goes into 150 7 times with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 26236.142857
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.

Going ahead to step 13:
21 goes into 30 1 times with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 26236.1428571
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.

Going ahead to step 14:
If we divide 90 by 21, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 26236.14285714
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.

After the division, we end up with 26236.14285714 and a remainder of 6e-09.