We're dividing 135988 by 3 
We're looking to find how many times 3 goes into 135988.

Going ahead to step 1:
3 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 3

Step 2:
When dividing 13 by 3, we get 4 with a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 12 from 13 leaves us with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 3

On to step 3:
15 divided by 3 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 45.0
Deduct 15 from 15 and we're left with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 3

On to step 4:
9 divided by 3 is 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 453.0
The remainder is 0 after subtracting 9 from 9.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 3

Step 5:
If we divide 8 by 3, we get 2 and a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 4532.0
Deduct 6 from 8 and we're left with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 3

Step 6:
The number 3 fits into 28 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 45329.0
The remainder is 1 after subtracting 27 from 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
10 divided by 3 is 3 with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 45329.3
Subtracting 9 from 10 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 8:
10 divided by 3 is 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 45329.33
If we subtract 9 from 10, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 45329.33 with a remainder of 0.001.