86188389 ÷ 126 
We want to divide 86188389 by 126.

Moving on to step 1:
The number 126 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 126

Advancing to step 2:
126 goes into 86 0 times with a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Include the next digit (1) from the dividend after 86, then repeat: 861 / 126

On to step 3:
If we divide 861 by 126, we get 6 and a remainder of 105.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we take 756 away from 861, we end up with 105.
Include the next digit (8) from the dividend after 105, then repeat: 1058 / 126

Advancing to step 4:
126 goes into 1058 8 times with a remainder of 50.
The number 8 becomes the next digit in our result. 
Result so far: 68.0
Subtracting 1008 from 1058 leaves us with 50.
Grab the next digit (8) from the dividend, add it to 50, then carry on: 508 / 126

Step 5:
126 goes into 508 4 times with a remainder of 4.
Put 4 as the next digit of the answer. 
Result so far: 684.0
Subtract 504 from 508 to get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 126

Going ahead to step 6:
If we divide 43 by 126, we get 0 and a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 6840.0
The remainder is 43 after subtracting 0 from 43.
Fetch the next digit (8) from the dividend, attach it to 43 and continue: 438 / 126

On to step 7:
126 goes into 438 3 times with a remainder of 60.
The number 3 becomes the next digit in our result. 
Result so far: 68403.0
If we subtract 378 from 438, we get 60.
Grab the next digit (9) from the dividend, add it to 60, then carry on: 609 / 126

Going ahead to step 8:
126 can be fit into 609 4 times, resulting in a remainder of 105.
Write down 4 as next digit of the result. 
Result so far: 684034.0
Subtract 504 from 609 to get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Step 9:
The number 126 fits into 1050 8 times, leaving a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 684034.8
The remainder is 42 after subtracting 1008 from 1050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 10:
If we divide 420 by 126, we get 3 and a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 684034.83
If we take 378 away from 420, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 11:
When dividing 420 by 126, we get 3 with a remainder of 42.
The next digit of our result is 3. 
Result so far: 684034.833
Subtract 378 from 420 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

After the division, we end up with 684034.833 and a remainder of 0.0042.