561221 ÷ 51 
Let's see how many times 51 fits into 561221.

On to step 1:
If we divide 5 by 51, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 51

Advancing to step 2:
51 can be fit into 56 1 times, resulting in a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 51 away from 56, we end up with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 51

Advancing to step 3:
51 goes into 51 1 times with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 51 from 51, we get 0.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 51

On to step 4:
If we divide 2 by 51, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 110.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (2) from the dividend, attach it to 2 and continue: 22 / 51

Advancing to step 5:
22 divided by 51 is 0 with a remainder of 22.
Put 0 as the next digit of the answer. 
Result so far: 1100.0
If we subtract 0 from 22, we get 22.
Fetch the next digit (1) from the dividend, attach it to 22 and continue: 221 / 51

On to step 6:
51 goes into 221 4 times with a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 11004.0
Deduct 204 from 221 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.

Going ahead to step 7:
51 goes into 170 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 11004.3
If we take 153 away from 170, we end up 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 8:
51 goes into 170 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 11004.33
Subtracting 153 from 170 leaves us 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.

The final outcome is 11004.33, with a leftover of 0.017.