81860458 divided by 631 
We're looking to find how many times 631 goes into 81860458.

Let's proceed to step 1:
The number 631 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 631

Advancing to step 2:
81 divided by 631 is 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Bring next digit (8) of the dividend behind the 81 and repeat the process: 818 / 631

Moving on to step 3:
631 can be fit into 818 1 times, resulting in a remainder of 187.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 631 from 818 to get 187.
Grab the next digit (6) from the dividend, add it to 187, then carry on: 1876 / 631

Advancing to step 4:
631 goes into 1876 2 times with a remainder of 614.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we subtract 1262 from 1876, we get 614.
Include the next digit (0) from the dividend after 614, then repeat: 6140 / 631

Moving on to step 5:
631 goes into 6140 9 times with a remainder of 461.
Write down 9 as next digit of the result. 
Result so far: 129.0
Subtracting 5679 from 6140 leaves us with 461.
Include the next digit (4) from the dividend after 461, then repeat: 4614 / 631

Moving on to step 6:
The number 631 fits into 4614 7 times, leaving a remainder of 197.
Put 7 as the next digit of the answer. 
Result so far: 1297.0
Deduct 4417 from 4614 and we're left with 197.
Bring next digit (5) of the dividend behind the 197 and repeat the process: 1975 / 631

Going ahead to step 7:
631 goes into 1975 3 times with a remainder of 82.
The number 3 becomes the next digit in our result. 
Result so far: 12973.0
The remainder is 82 after subtracting 1893 from 1975.
Grab the next digit (8) from the dividend, add it to 82, then carry on: 828 / 631

Advancing to step 8:
The number 631 fits into 828 1 times, leaving a remainder of 197.
Use 1 as the next digit of our solution. 
Result so far: 129731.0
Subtracting 631 from 828 leaves us with 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Advancing to step 9:
631 goes into 1970 3 times with a remainder of 77.
The number 3 becomes the next digit in our result. 
Result so far: 129731.3
Subtracting 1893 from 1970 leaves us with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Step 10:
The number 631 fits into 770 1 times, leaving a remainder of 139.
Put 1 as the next digit of the answer. 
Result so far: 129731.31
If we take 631 away from 770, we end up with 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Moving on to step 11:
631 goes into 1390 2 times with a remainder of 128.
The next digit of our result is 2. 
Result so far: 129731.312
Subtracting 1262 from 1390 leaves us with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Moving on to step 12:
631 can be fit into 1280 2 times, resulting in a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 129731.3122
Subtracting 1262 from 1280 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

After the division, we end up with 129731.3122 and a remainder of 0.00018.