We divide 81581310 by 221
We're looking to find how many times 221 goes into 81581310.

On to step 1:
221 can be fit into 8 0 times, resulting in a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 221

Going ahead to step 2:
221 can be fit into 81 0 times, resulting in a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Append the next digit (5) from the dividend to 81 and continue with: 815 / 221

On to step 3:
815 divided by 221 is 3 with a remainder of 152.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 663 from 815 leaves us with 152.
Fetch the next digit (8) from the dividend, attach it to 152 and continue: 1528 / 221

Going ahead to step 4:
When dividing 1528 by 221, we get 6 with a remainder of 202.
Use 6 as the next digit of our solution. 
Result so far: 36.0
Deduct 1326 from 1528 and we're left with 202.
Fetch the next digit (1) from the dividend, attach it to 202 and continue: 2021 / 221

Going ahead to step 5:
If we divide 2021 by 221, we get 9 and a remainder of 32.
Put 9 as the next digit of the answer. 
Result so far: 369.0
If we take 1989 away from 2021, we end up with 32.
Bring next digit (3) of the dividend behind the 32 and repeat the process: 323 / 221

Let's proceed to step 6:
If we divide 323 by 221, we get 1 and a remainder of 102.
Record the quotient 1 as the next digit in the result. 
Result so far: 3691.0
Subtracting 221 from 323 leaves us with 102.
Fetch the next digit (1) from the dividend, attach it to 102 and continue: 1021 / 221

Going ahead to step 7:
The number 221 fits into 1021 4 times, leaving a remainder of 137.
The next digit of our result is 4. 
Result so far: 36914.0
The remainder is 137 after subtracting 884 from 1021.
Bring next digit (0) of the dividend behind the 137 and repeat the process: 1370 / 221

Moving on to step 8:
221 can be fit into 1370 6 times, resulting in a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 369146.0
If we take 1326 away from 1370, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 9:
221 can be fit into 440 1 times, resulting in a remainder of 219.
The next digit of our result is 1. 
Result so far: 369146.1
Subtracting 221 from 440 leaves us with 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Going ahead to step 10:
The number 221 fits into 2190 9 times, leaving a remainder of 201.
Record the quotient 9 as the next digit in the result. 
Result so far: 369146.19
Subtracting 1989 from 2190 leaves us with 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Advancing to step 11:
221 can be fit into 2010 9 times, resulting in a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 369146.199
Subtracting 1989 from 2010 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Our division results in 369146.199 with a remaining 0.0021.