We're dividing 16221561 by 305 
We're looking to find how many times 305 goes into 16221561.

Step 1:
The number 305 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 305

Step 2:
305 can be fit into 16 0 times, resulting in a remainder of 16.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Bring next digit (2) of the dividend behind the 16 and repeat the process: 162 / 305

Moving on to step 3:
305 can be fit into 162 0 times, resulting in a remainder of 162.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 162 after subtracting 0 from 162.
Fetch the next digit (2) from the dividend, attach it to 162 and continue: 1622 / 305

Advancing to step 4:
If we divide 1622 by 305, we get 5 and a remainder of 97.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 1525 from 1622 to get 97.
Take the next digit (1) from the dividend and append it to 97, then repeat: 971 / 305

Going ahead to step 5:
971 divided by 305 is 3 with a remainder of 56.
Write down 3 as next digit of the result. 
Result so far: 53.0
Subtracting 915 from 971 leaves us with 56.
Fetch the next digit (5) from the dividend, attach it to 56 and continue: 565 / 305

Advancing to step 6:
565 divided by 305 is 1 with a remainder of 260.
The number 1 becomes the next digit in our result. 
Result so far: 531.0
Deduct 305 from 565 and we're left with 260.
Grab the next digit (6) from the dividend, add it to 260, then carry on: 2606 / 305

Moving on to step 7:
305 goes into 2606 8 times with a remainder of 166.
Put 8 as the next digit of the answer. 
Result so far: 5318.0
Subtract 2440 from 2606 to get 166.
Include the next digit (1) from the dividend after 166, then repeat: 1661 / 305

Let's proceed to step 8:
The number 305 fits into 1661 5 times, leaving a remainder of 136.
Put 5 as the next digit of the answer. 
Result so far: 53185.0
If we take 1525 away from 1661, we end up with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Advancing to step 9:
When dividing 1360 by 305, we get 4 with a remainder of 140.
Use 4 as the next digit of our solution. 
Result so far: 53185.4
Deduct 1220 from 1360 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 10:
305 goes into 1400 4 times with a remainder of 180.
Write down 4 as next digit of the result. 
Result so far: 53185.44
Deduct 1220 from 1400 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

The final result is 53185.44 with a remainder of 0.18.