309900 divided by 87 
Our goal is to divide 309900 by 87.

Let's proceed to step 1:
3 divided by 87 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 87

Moving on to step 2:
87 can be fit into 30 0 times, resulting in a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Take the next digit (9) from the dividend and append it to 30, then repeat: 309 / 87

Let's proceed to step 3:
87 goes into 309 3 times with a remainder of 48.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 261 from 309 leaves us with 48.
Append the next digit (9) from the dividend to 48 and continue with: 489 / 87

On to step 4:
When dividing 489 by 87, we get 5 with a remainder of 54.
Write down 5 as next digit of the result. 
Result so far: 35.0
Deduct 435 from 489 and we're left with 54.
Include the next digit (0) from the dividend after 54, then repeat: 540 / 87

Step 5:
When dividing 540 by 87, we get 6 with a remainder of 18.
The next digit of our result is 6. 
Result so far: 356.0
Subtract 522 from 540 to get 18.
Include the next digit (0) from the dividend after 18, then repeat: 180 / 87

Let's proceed to step 6:
87 goes into 180 2 times with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 3562.0
Subtract 174 from 180 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
When dividing 60 by 87, we get 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 3562.0
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 8:
The number 87 fits into 600 6 times, leaving a remainder of 78.
The number 6 becomes the next digit in our result. 
Result so far: 3562.06
Deduct 522 from 600 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 9:
When dividing 780 by 87, we get 8 with a remainder of 84.
Put 8 as the next digit of the answer. 
Result so far: 3562.068
If we take 696 away from 780, we end up with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Going ahead to step 10:
87 goes into 840 9 times with a remainder of 57.
Put 9 as the next digit of the answer. 
Result so far: 3562.0689
If we take 783 away from 840, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 11:
570 divided by 87 is 6 with a remainder of 48.
The next digit of our result is 6. 
Result so far: 3562.06896
Subtracting 522 from 570 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 12:
When dividing 480 by 87, we get 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 3562.068965
The remainder is 45 after subtracting 435 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 13:
87 can be fit into 450 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 3562.0689655
Deduct 435 from 450 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Our division results in 3562.0689655 with a remaining 1.5e-07.