We're dividing 87991656 by 603 
We want to figure out the number of times 87991656 can be divided by 603.

On to step 1:
8 divided by 603 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 603

Advancing to step 2:
87 divided by 603 is 0 with a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 87 and we're left with 87.
Include the next digit (9) from the dividend after 87, then repeat: 879 / 603

Moving on to step 3:
The number 603 fits into 879 1 times, leaving a remainder of 276.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 603 from 879 and we're left with 276.
Take the next digit (9) from the dividend and append it to 276, then repeat: 2769 / 603

Moving on to step 4:
The number 603 fits into 2769 4 times, leaving a remainder of 357.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Deduct 2412 from 2769 and we're left with 357.
Append the next digit (1) from the dividend to 357 and continue with: 3571 / 603

On to step 5:
603 goes into 3571 5 times with a remainder of 556.
Put 5 as the next digit of the answer. 
Result so far: 145.0
Subtracting 3015 from 3571 leaves us with 556.
Bring next digit (6) of the dividend behind the 556 and repeat the process: 5566 / 603

Step 6:
5566 divided by 603 is 9 with a remainder of 139.
Record the quotient 9 as the next digit in the result. 
Result so far: 1459.0
If we subtract 5427 from 5566, we get 139.
Include the next digit (5) from the dividend after 139, then repeat: 1395 / 603

Advancing to step 7:
The number 603 fits into 1395 2 times, leaving a remainder of 189.
Use 2 as the next digit of our solution. 
Result so far: 14592.0
If we subtract 1206 from 1395, we get 189.
Grab the next digit (6) from the dividend, add it to 189, then carry on: 1896 / 603

Moving on to step 8:
When dividing 1896 by 603, we get 3 with a remainder of 87.
Put 3 as the next digit of the answer. 
Result so far: 145923.0
Deduct 1809 from 1896 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 9:
603 goes into 870 1 times with a remainder of 267.
Write down 1 as next digit of the result. 
Result so far: 145923.1
Subtract 603 from 870 to get 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Advancing to step 10:
603 goes into 2670 4 times with a remainder of 258.
Write down 4 as next digit of the result. 
Result so far: 145923.14
The remainder is 258 after subtracting 2412 from 2670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Advancing to step 11:
When dividing 2580 by 603, we get 4 with a remainder of 168.
Put 4 as the next digit of the answer. 
Result so far: 145923.144
Subtract 2412 from 2580 to get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Our division results in 145923.144 with a remaining 0.0168.