Let's divide 85573431 by 645
Our goal is to divide 85573431 by 645.

Let's proceed to step 1:
When dividing 8 by 645, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 645

Moving on to step 2:
645 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
If we subtract 0 from 85, we get 85.
Grab the next digit (5) from the dividend, add it to 85, then carry on: 855 / 645

Moving on to step 3:
645 can be fit into 855 1 times, resulting in a remainder of 210.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 645 from 855 leaves us with 210.
Grab the next digit (7) from the dividend, add it to 210, then carry on: 2107 / 645

Let's proceed to step 4:
2107 divided by 645 is 3 with a remainder of 172.
The next digit of our result is 3. 
Result so far: 13.0
Deduct 1935 from 2107 and we're left with 172.
Bring next digit (3) of the dividend behind the 172 and repeat the process: 1723 / 645

Let's proceed to step 5:
645 goes into 1723 2 times with a remainder of 433.
The next digit of our result is 2. 
Result so far: 132.0
Subtract 1290 from 1723 to get 433.
Include the next digit (4) from the dividend after 433, then repeat: 4334 / 645

Step 6:
645 can be fit into 4334 6 times, resulting in a remainder of 464.
Write down 6 as next digit of the result. 
Result so far: 1326.0
Subtract 3870 from 4334 to get 464.
Fetch the next digit (3) from the dividend, attach it to 464 and continue: 4643 / 645

Step 7:
If we divide 4643 by 645, we get 7 and a remainder of 128.
Put 7 as the next digit of the answer. 
Result so far: 13267.0
If we take 4515 away from 4643, we end up with 128.
Append the next digit (1) from the dividend to 128 and continue with: 1281 / 645

Going ahead to step 8:
1281 divided by 645 is 1 with a remainder of 636.
Record the quotient 1 as the next digit in the result. 
Result so far: 132671.0
Subtracting 645 from 1281 leaves us with 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Moving on to step 9:
6360 divided by 645 is 9 with a remainder of 555.
Write down 9 as next digit of the result. 
Result so far: 132671.9
Deduct 5805 from 6360 and we're left with 555.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5550, and continue the process.

Advancing to step 10:
If we divide 5550 by 645, we get 8 and a remainder of 390.
Use 8 as the next digit of our solution. 
Result so far: 132671.98
If we take 5160 away from 5550, we end up with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Step 11:
The number 645 fits into 3900 6 times, leaving a remainder of 30.
Write down 6 as next digit of the result. 
Result so far: 132671.986
Subtracting 3870 from 3900 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 12:
300 divided by 645 is 0 with a remainder of 300.
The next digit of our result is 0. 
Result so far: 132671.986
Deduct 0 from 300 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

On to step 13:
If we divide 3000 by 645, we get 4 and a remainder of 420.
The next digit of our result is 4. 
Result so far: 132671.98604
If we take 2580 away from 3000, we end up with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Advancing to step 14:
If we divide 4200 by 645, we get 6 and a remainder of 330.
Use 6 as the next digit of our solution. 
Result so far: 132671.986046
Subtracting 3870 from 4200 leaves us with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Let's proceed to step 15:
If we divide 3300 by 645, we get 5 and a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 132671.9860465
Subtracting 3225 from 3300 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 16:
750 divided by 645 is 1 with a remainder of 105.
The number 1 becomes the next digit in our result. 
Result so far: 132671.98604651
Deduct 645 from 750 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Our division results in 132671.98604651 with a remaining 1.05e-07.