90398972 ÷ 144 
We want to figure out the number of times 90398972 can be divided by 144.

Step 1:
144 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 144

Let's proceed to step 2:
If we divide 90 by 144, we get 0 and a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Bring next digit (3) of the dividend behind the 90 and repeat the process: 903 / 144

Advancing to step 3:
903 divided by 144 is 6 with a remainder of 39.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 864 from 903, we get 39.
Fetch the next digit (9) from the dividend, attach it to 39 and continue: 399 / 144

Moving on to step 4:
144 can be fit into 399 2 times, resulting in a remainder of 111.
The number 2 becomes the next digit in our result. 
Result so far: 62.0
Deduct 288 from 399 and we're left with 111.
Take the next digit (8) from the dividend and append it to 111, then repeat: 1118 / 144

Step 5:
144 goes into 1118 7 times with a remainder of 110.
The next digit of our result is 7. 
Result so far: 627.0
Subtracting 1008 from 1118 leaves us with 110.
Include the next digit (9) from the dividend after 110, then repeat: 1109 / 144

Let's proceed to step 6:
The number 144 fits into 1109 7 times, leaving a remainder of 101.
Record the quotient 7 as the next digit in the result. 
Result so far: 6277.0
If we subtract 1008 from 1109, we get 101.
Grab the next digit (7) from the dividend, add it to 101, then carry on: 1017 / 144

Let's proceed to step 7:
1017 divided by 144 is 7 with a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 62777.0
If we take 1008 away from 1017, we end up with 9.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 144

Going ahead to step 8:
When dividing 92 by 144, we get 0 with a remainder of 92.
Write down 0 as next digit of the result. 
Result so far: 627770.0
Subtract 0 from 92 to get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Step 9:
The number 144 fits into 920 6 times, leaving a remainder of 56.
Write down 6 as next digit of the result. 
Result so far: 627770.6
Deduct 864 from 920 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 10:
The number 144 fits into 560 3 times, leaving a remainder of 128.
Write down 3 as next digit of the result. 
Result so far: 627770.63
The remainder is 128 after subtracting 432 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Let's proceed to step 11:
1280 divided by 144 is 8 with a remainder of 128.
Write down 8 as next digit of the result. 
Result so far: 627770.638
Subtract 1152 from 1280 to get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 12:
144 goes into 1280 8 times with a remainder of 128.
The next digit of our result is 8. 
Result so far: 627770.6388
If we subtract 1152 from 1280, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

After the division, we end up with 627770.6388 and a remainder of 0.00128.