We look at the division of 15518431 by 864 
We're looking to find how many times 864 goes into 15518431.

Advancing to step 1:
The number 864 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 864

On to step 2:
864 goes into 15 0 times with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Grab the next digit (5) from the dividend, add it to 15, then carry on: 155 / 864

Step 3:
When dividing 155 by 864, we get 0 with a remainder of 155.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 155 and we're left with 155.
Bring next digit (1) of the dividend behind the 155 and repeat the process: 1551 / 864

Advancing to step 4:
864 goes into 1551 1 times with a remainder of 687.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 864 from 1551 to get 687.
Append the next digit (8) from the dividend to 687 and continue with: 6878 / 864

On to step 5:
864 can be fit into 6878 7 times, resulting in a remainder of 830.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
If we subtract 6048 from 6878, we get 830.
Append the next digit (4) from the dividend to 830 and continue with: 8304 / 864

Moving on to step 6:
864 goes into 8304 9 times with a remainder of 528.
The number 9 becomes the next digit in our result. 
Result so far: 179.0
Subtract 7776 from 8304 to get 528.
Grab the next digit (3) from the dividend, add it to 528, then carry on: 5283 / 864

Advancing to step 7:
If we divide 5283 by 864, we get 6 and a remainder of 99.
Record the quotient 6 as the next digit in the result. 
Result so far: 1796.0
If we subtract 5184 from 5283, we get 99.
Bring next digit (1) of the dividend behind the 99 and repeat the process: 991 / 864

Let's proceed to step 8:
If we divide 991 by 864, we get 1 and a remainder of 127.
Put 1 as the next digit of the answer. 
Result so far: 17961.0
If we take 864 away from 991, we end up with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Moving on to step 9:
864 can be fit into 1270 1 times, resulting in a remainder of 406.
Write down 1 as next digit of the result. 
Result so far: 17961.1
The remainder is 406 after subtracting 864 from 1270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Going ahead to step 10:
4060 divided by 864 is 4 with a remainder of 604.
Write down 4 as next digit of the result. 
Result so far: 17961.14
Subtract 3456 from 4060 to get 604.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6040, and continue the process.

Let's proceed to step 11:
When dividing 6040 by 864, we get 6 with a remainder of 856.
Write down 6 as next digit of the result. 
Result so far: 17961.146
If we take 5184 away from 6040, we end up with 856.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8560, and continue the process.

Let's proceed to step 12:
If we divide 8560 by 864, we get 9 and a remainder of 784.
The number 9 becomes the next digit in our result. 
Result so far: 17961.1469
Subtract 7776 from 8560 to get 784.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Advancing to step 13:
864 can be fit into 7840 9 times, resulting in a remainder of 64.
Put 9 as the next digit of the answer. 
Result so far: 17961.14699
Subtract 7776 from 7840 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

After the division, we end up with 17961.14699 and a remainder of 6.4e-05.