We're dividing 81311645 by 642 
Let's see how many times 642 fits into 81311645.

On to step 1:
The number 642 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 642

Step 2:
When dividing 81 by 642, we get 0 with a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Include the next digit (3) from the dividend after 81, then repeat: 813 / 642

Advancing to step 3:
642 goes into 813 1 times with a remainder of 171.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 171 after subtracting 642 from 813.
Include the next digit (1) from the dividend after 171, then repeat: 1711 / 642

Let's proceed to step 4:
If we divide 1711 by 642, we get 2 and a remainder of 427.
The next digit of our result is 2. 
Result so far: 12.0
If we take 1284 away from 1711, we end up with 427.
Bring next digit (1) of the dividend behind the 427 and repeat the process: 4271 / 642

Let's proceed to step 5:
642 can be fit into 4271 6 times, resulting in a remainder of 419.
Record the quotient 6 as the next digit in the result. 
Result so far: 126.0
Subtracting 3852 from 4271 leaves us with 419.
Include the next digit (6) from the dividend after 419, then repeat: 4196 / 642

Advancing to step 6:
4196 divided by 642 is 6 with a remainder of 344.
Record the quotient 6 as the next digit in the result. 
Result so far: 1266.0
The remainder is 344 after subtracting 3852 from 4196.
Include the next digit (4) from the dividend after 344, then repeat: 3444 / 642

Going ahead to step 7:
642 can be fit into 3444 5 times, resulting in a remainder of 234.
The number 5 becomes the next digit in our result. 
Result so far: 12665.0
The remainder is 234 after subtracting 3210 from 3444.
Append the next digit (5) from the dividend to 234 and continue with: 2345 / 642

On to step 8:
642 goes into 2345 3 times with a remainder of 419.
Use 3 as the next digit of our solution. 
Result so far: 126653.0
Deduct 1926 from 2345 and we're left with 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4190, and continue the process.

Advancing to step 9:
642 can be fit into 4190 6 times, resulting in a remainder of 338.
The number 6 becomes the next digit in our result. 
Result so far: 126653.6
Subtracting 3852 from 4190 leaves us with 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Advancing to step 10:
642 goes into 3380 5 times with a remainder of 170.
Record the quotient 5 as the next digit in the result. 
Result so far: 126653.65
Deduct 3210 from 3380 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

On to step 11:
642 goes into 1700 2 times with a remainder of 416.
Put 2 as the next digit of the answer. 
Result so far: 126653.652
Subtracting 1284 from 1700 leaves us 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.

Going ahead to step 12:
When dividing 4160 by 642, we get 6 with a remainder of 308.
Use 6 as the next digit of our solution. 
Result so far: 126653.6526
Subtract 3852 from 4160 to get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Going ahead to step 13:
The number 642 fits into 3080 4 times, leaving a remainder of 512.
The number 4 becomes the next digit in our result. 
Result so far: 126653.65264
Subtract 2568 from 3080 to get 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Advancing to step 14:
5120 divided by 642 is 7 with a remainder of 626.
Write down 7 as next digit of the result. 
Result so far: 126653.652647
Deduct 4494 from 5120 and we're left with 626.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6260, and continue the process.

Let's proceed to step 15:
The number 642 fits into 6260 9 times, leaving a remainder of 482.
The number 9 becomes the next digit in our result. 
Result so far: 126653.6526479
Subtracting 5778 from 6260 leaves us with 482.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4820, and continue the process.

Let's proceed to step 16:
If we divide 4820 by 642, we get 7 and a remainder of 326.
The number 7 becomes the next digit in our result. 
Result so far: 126653.65264797
Subtracting 4494 from 4820 leaves us with 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Our division results in 126653.65264797 with a remaining 3.26e-07.