Let's divide 87991424 by 621
We want to figure out the number of times 87991424 can be divided by 621.

Step 1:
The number 621 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
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 621

Let's proceed to step 2:
If we divide 87 by 621, we get 0 and a remainder of 87.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Bring next digit (9) of the dividend behind the 87 and repeat the process: 879 / 621

Going ahead to step 3:
If we divide 879 by 621, we get 1 and a remainder of 258.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 621 from 879 and we're left with 258.
Bring next digit (9) of the dividend behind the 258 and repeat the process: 2589 / 621

Let's proceed to step 4:
621 goes into 2589 4 times with a remainder of 105.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
If we take 2484 away from 2589, we end up with 105.
Grab the next digit (1) from the dividend, add it to 105, then carry on: 1051 / 621

Going ahead to step 5:
The number 621 fits into 1051 1 times, leaving a remainder of 430.
The number 1 becomes the next digit in our result. 
Result so far: 141.0
Subtract 621 from 1051 to get 430.
Bring next digit (4) of the dividend behind the 430 and repeat the process: 4304 / 621

Moving on to step 6:
621 can be fit into 4304 6 times, resulting in a remainder of 578.
Record the quotient 6 as the next digit in the result. 
Result so far: 1416.0
The remainder is 578 after subtracting 3726 from 4304.
Bring next digit (2) of the dividend behind the 578 and repeat the process: 5782 / 621

Going ahead to step 7:
The number 621 fits into 5782 9 times, leaving a remainder of 193.
The number 9 becomes the next digit in our result. 
Result so far: 14169.0
Subtracting 5589 from 5782 leaves us with 193.
Fetch the next digit (4) from the dividend, attach it to 193 and continue: 1934 / 621

Moving on to step 8:
621 goes into 1934 3 times with a remainder of 71.
The next digit of our result is 3. 
Result so far: 141693.0
Subtract 1863 from 1934 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 9:
710 divided by 621 is 1 with a remainder of 89.
Use 1 as the next digit of our solution. 
Result so far: 141693.1
Subtract 621 from 710 to get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 10:
621 can be fit into 890 1 times, resulting in a remainder of 269.
Use 1 as the next digit of our solution. 
Result so far: 141693.11
The remainder is 269 after subtracting 621 from 890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

Our division results in 141693.11 with a remaining 0.269.