13919968 ÷ 90 
Let's see how many times 90 fits into 13919968.

Step 1:
90 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 90

Going ahead to step 2:
13 divided by 90 is 0 with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Append the next digit (9) from the dividend to 13 and continue with: 139 / 90

On to step 3:
The number 90 fits into 139 1 times, leaving a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 90 from 139 to get 49.
Grab the next digit (1) from the dividend, add it to 49, then carry on: 491 / 90

On to step 4:
The number 90 fits into 491 5 times, leaving a remainder of 41.
Put 5 as the next digit of the answer. 
Result so far: 15.0
The remainder is 41 after subtracting 450 from 491.
Fetch the next digit (9) from the dividend, attach it to 41 and continue: 419 / 90

Moving on to step 5:
90 goes into 419 4 times with a remainder of 59.
Put 4 as the next digit of the answer. 
Result so far: 154.0
The remainder is 59 after subtracting 360 from 419.
Include the next digit (9) from the dividend after 59, then repeat: 599 / 90

Let's proceed to step 6:
If we divide 599 by 90, we get 6 and a remainder of 59.
The next digit of our result is 6. 
Result so far: 1546.0
Subtracting 540 from 599 leaves us with 59.
Take the next digit (6) from the dividend and append it to 59, then repeat: 596 / 90

Moving on to step 7:
90 goes into 596 6 times with a remainder of 56.
Put 6 as the next digit of the answer. 
Result so far: 15466.0
The remainder is 56 after subtracting 540 from 596.
Include the next digit (8) from the dividend after 56, then repeat: 568 / 90

Going ahead to step 8:
90 goes into 568 6 times with a remainder of 28.
Write down 6 as next digit of the result. 
Result so far: 154666.0
Subtract 540 from 568 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 9:
When dividing 280 by 90, we get 3 with a remainder of 10.
Use 3 as the next digit of our solution. 
Result so far: 154666.3
The remainder is 10 after subtracting 270 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
If we divide 100 by 90, we get 1 and a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 154666.31
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 11:
90 can be fit into 100 1 times, resulting in a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 154666.311
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 154666.311 with a balance of 0.001.