120509 ÷ 87 
We want to figure out the number of times 120509 can be divided by 87.

Going ahead to step 1:
87 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 87

Let's proceed to step 2:
The number 87 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Grab the next digit (0) from the dividend, add it to 12, then carry on: 120 / 87

Advancing to step 3:
The number 87 fits into 120 1 times, leaving a remainder of 33.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 87 from 120 leaves us with 33.
Include the next digit (5) from the dividend after 33, then repeat: 335 / 87

Moving on to step 4:
87 can be fit into 335 3 times, resulting in a remainder of 74.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtract 261 from 335 to get 74.
Append the next digit (0) from the dividend to 74 and continue with: 740 / 87

Moving on to step 5:
87 goes into 740 8 times with a remainder of 44.
The next digit of our result is 8. 
Result so far: 138.0
Subtracting 696 from 740 leaves us with 44.
Bring next digit (9) of the dividend behind the 44 and repeat the process: 449 / 87

Step 6:
87 can be fit into 449 5 times, resulting in a remainder of 14.
The next digit of our result is 5. 
Result so far: 1385.0
If we subtract 435 from 449, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 7:
The number 87 fits into 140 1 times, leaving a remainder of 53.
Record the quotient 1 as the next digit in the result. 
Result so far: 1385.1
The remainder is 53 after subtracting 87 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 8:
530 divided by 87 is 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 1385.16
Deduct 522 from 530 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
If we divide 80 by 87, we get 0 and a remainder of 80.
The next digit of our result is 0. 
Result so far: 1385.16
If we take 0 away from 80, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 10:
If we divide 800 by 87, we get 9 and a remainder of 17.
Write down 9 as next digit of the result. 
Result so far: 1385.1609
If we take 783 away from 800, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 11:
87 can be fit into 170 1 times, resulting in a remainder of 83.
The next digit of our result is 1. 
Result so far: 1385.16091
Deduct 87 from 170 and we're left with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

On to step 12:
When dividing 830 by 87, we get 9 with a remainder of 47.
Write down 9 as next digit of the result. 
Result so far: 1385.160919
Deduct 783 from 830 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 13:
If we divide 470 by 87, we get 5 and a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 1385.1609195
Subtract 435 from 470 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 14:
The number 87 fits into 350 4 times, leaving a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 1385.16091954
Subtracting 348 from 350 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 1385.16091954, with a leftover of 2e-09.