We're dividing 85391591 by 661 
We want to figure out the number of times 85391591 can be divided by 661.

Step 1:
661 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 661

On to step 2:
661 can be fit into 85 0 times, resulting in a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Grab the next digit (3) from the dividend, add it to 85, then carry on: 853 / 661

On to step 3:
661 goes into 853 1 times with a remainder of 192.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 661 from 853 and we're left with 192.
Grab the next digit (9) from the dividend, add it to 192, then carry on: 1929 / 661

Going ahead to step 4:
If we divide 1929 by 661, we get 2 and a remainder of 607.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we take 1322 away from 1929, we end up with 607.
Fetch the next digit (1) from the dividend, attach it to 607 and continue: 6071 / 661

Advancing to step 5:
6071 divided by 661 is 9 with a remainder of 122.
The number 9 becomes the next digit in our result. 
Result so far: 129.0
Subtracting 5949 from 6071 leaves us with 122.
Bring next digit (5) of the dividend behind the 122 and repeat the process: 1225 / 661

On to step 6:
661 goes into 1225 1 times with a remainder of 564.
Write down 1 as next digit of the result. 
Result so far: 1291.0
If we subtract 661 from 1225, we get 564.
Fetch the next digit (9) from the dividend, attach it to 564 and continue: 5649 / 661

Going ahead to step 7:
661 can be fit into 5649 8 times, resulting in a remainder of 361.
Put 8 as the next digit of the answer. 
Result so far: 12918.0
The remainder is 361 after subtracting 5288 from 5649.
Fetch the next digit (1) from the dividend, attach it to 361 and continue: 3611 / 661

Going ahead to step 8:
661 can be fit into 3611 5 times, resulting in a remainder of 306.
Put 5 as the next digit of the answer. 
Result so far: 129185.0
Subtract 3305 from 3611 to get 306.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3060, and continue the process.

Moving on to step 9:
The number 661 fits into 3060 4 times, leaving a remainder of 416.
The number 4 becomes the next digit in our result. 
Result so far: 129185.4
Deduct 2644 from 3060 and we're left with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Step 10:
If we divide 4160 by 661, we get 6 and a remainder of 194.
Write down 6 as next digit of the result. 
Result so far: 129185.46
The remainder is 194 after subtracting 3966 from 4160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Advancing to step 11:
661 goes into 1940 2 times with a remainder of 618.
Use 2 as the next digit of our solution. 
Result so far: 129185.462
Deduct 1322 from 1940 and we're left with 618.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6180, and continue the process.

Step 12:
6180 divided by 661 is 9 with a remainder of 231.
The number 9 becomes the next digit in our result. 
Result so far: 129185.4629
Subtract 5949 from 6180 to get 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Advancing to step 13:
The number 661 fits into 2310 3 times, leaving a remainder of 327.
Put 3 as the next digit of the answer. 
Result so far: 129185.46293
Deduct 1983 from 2310 and we're left with 327.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3270, and continue the process.

Moving on to step 14:
661 goes into 3270 4 times with a remainder of 626.
The next digit of our result is 4. 
Result so far: 129185.462934
Subtract 2644 from 3270 to get 626.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6260, and continue the process.

Moving on to step 15:
661 goes into 6260 9 times with a remainder of 311.
Use 9 as the next digit of our solution. 
Result so far: 129185.4629349
The remainder is 311 after subtracting 5949 from 6260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

Let's proceed to step 16:
3110 divided by 661 is 4 with a remainder of 466.
The next digit of our result is 4. 
Result so far: 129185.46293494
If we take 2644 away from 3110, we end up with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

After the division, we end up with 129185.46293494 and a remainder of 4.66e-07.