We look at the division of 9991455 by 144 
We want to divide 9991455 by 144.

Advancing to step 1:
The number 144 fits into 9 0 times, leaving a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 144

Going ahead to step 2:
99 divided by 144 is 0 with a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 99 to get 99.
Bring next digit (9) of the dividend behind the 99 and repeat the process: 999 / 144

Going ahead to step 3:
When dividing 999 by 144, we get 6 with a remainder of 135.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 135 after subtracting 864 from 999.
Grab the next digit (1) from the dividend, add it to 135, then carry on: 1351 / 144

Step 4:
1351 divided by 144 is 9 with a remainder of 55.
The number 9 becomes the next digit in our result. 
Result so far: 69.0
If we take 1296 away from 1351, we end up with 55.
Append the next digit (4) from the dividend to 55 and continue with: 554 / 144

Moving on to step 5:
When dividing 554 by 144, we get 3 with a remainder of 122.
Use 3 as the next digit of our solution. 
Result so far: 693.0
Deduct 432 from 554 and we're left with 122.
Include the next digit (5) from the dividend after 122, then repeat: 1225 / 144

On to step 6:
The number 144 fits into 1225 8 times, leaving a remainder of 73.
The next digit of our result is 8. 
Result so far: 6938.0
Subtracting 1152 from 1225 leaves us with 73.
Grab the next digit (5) from the dividend, add it to 73, then carry on: 735 / 144

Advancing to step 7:
144 goes into 735 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 69385.0
If we subtract 720 from 735, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 8:
144 can be fit into 150 1 times, resulting in a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 69385.1
If we take 144 away from 150, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 9:
When dividing 60 by 144, we get 0 with a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 69385.1
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 10:
If we divide 600 by 144, we get 4 and a remainder of 24.
Write down 4 as next digit of the result. 
Result so far: 69385.104
The remainder is 24 after subtracting 576 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 11:
When dividing 240 by 144, we get 1 with a remainder of 96.
Record the quotient 1 as the next digit in the result. 
Result so far: 69385.1041
Subtract 144 from 240 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 12:
If we divide 960 by 144, we get 6 and a remainder of 96.
Write down 6 as next digit of the result. 
Result so far: 69385.10416
Subtract 864 from 960 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Moving on to step 13:
144 can be fit into 960 6 times, resulting in a remainder of 96.
The number 6 becomes the next digit in our result. 
Result so far: 69385.104166
Deduct 864 from 960 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

After the division, we end up with 69385.104166 and a remainder of 9.6e-06.