72185870 ÷ 859 
We want to divide 72185870 by 859.

On to step 1:
859 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 859

Moving on to step 2:
The number 859 fits into 72 0 times, leaving a remainder of 72.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 72 to get 72.
Include the next digit (1) from the dividend after 72, then repeat: 721 / 859

On to step 3:
859 can be fit into 721 0 times, resulting in a remainder of 721.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 721 after subtracting 0 from 721.
Take the next digit (8) from the dividend and append it to 721, then repeat: 7218 / 859

Step 4:
The number 859 fits into 7218 8 times, leaving a remainder of 346.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 6872 from 7218 and we're left with 346.
Append the next digit (5) from the dividend to 346 and continue with: 3465 / 859

Going ahead to step 5:
The number 859 fits into 3465 4 times, leaving a remainder of 29.
Use 4 as the next digit of our solution. 
Result so far: 84.0
Subtract 3436 from 3465 to get 29.
Include the next digit (8) from the dividend after 29, then repeat: 298 / 859

Going ahead to step 6:
When dividing 298 by 859, we get 0 with a remainder of 298.
Use 0 as the next digit of our solution. 
Result so far: 840.0
The remainder is 298 after subtracting 0 from 298.
Include the next digit (7) from the dividend after 298, then repeat: 2987 / 859

Moving on to step 7:
859 can be fit into 2987 3 times, resulting in a remainder of 410.
Write down 3 as next digit of the result. 
Result so far: 8403.0
Deduct 2577 from 2987 and we're left with 410.
Fetch the next digit (0) from the dividend, attach it to 410 and continue: 4100 / 859

Going ahead to step 8:
859 goes into 4100 4 times with a remainder of 664.
Record the quotient 4 as the next digit in the result. 
Result so far: 84034.0
The remainder is 664 after subtracting 3436 from 4100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6640, and continue the process.

Moving on to step 9:
The number 859 fits into 6640 7 times, leaving a remainder of 627.
The next digit of our result is 7. 
Result so far: 84034.7
Deduct 6013 from 6640 and we're left with 627.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6270, and continue the process.

Step 10:
6270 divided by 859 is 7 with a remainder of 257.
Record the quotient 7 as the next digit in the result. 
Result so far: 84034.77
Subtract 6013 from 6270 to get 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2570, and continue the process.

Our division results in 84034.77 with a remaining 0.257.