12509 ÷ 89 
Let's see how many times 89 fits into 12509.

Step 1:
When dividing 1 by 89, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 89

Moving on to step 2:
The number 89 fits into 12 0 times, leaving a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Include the next digit (5) from the dividend after 12, then repeat: 125 / 89

Let's proceed to step 3:
89 can be fit into 125 1 times, resulting in a remainder of 36.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 89 from 125 to get 36.
Bring next digit (0) of the dividend behind the 36 and repeat the process: 360 / 89

Going ahead to step 4:
89 goes into 360 4 times with a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 14.0
Deduct 356 from 360 and we're left with 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 89

Going ahead to step 5:
The number 89 fits into 49 0 times, leaving a remainder of 49.
The next digit of our result is 0. 
Result so far: 140.0
If we take 0 away from 49, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 6:
89 can be fit into 490 5 times, resulting in a remainder of 45.
The next digit of our result is 5. 
Result so far: 140.5
If we subtract 445 from 490, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 7:
450 divided by 89 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 140.55
If we take 445 away from 450, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Our division results in 140.55 with a remaining 0.005.