We look at the division of 388764 by 90 
We want to figure out the number of times 388764 can be divided by 90.

Going ahead to step 1:
3 divided by 90 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 90

On to step 2:
The number 90 fits into 38 0 times, leaving a remainder of 38.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 38 leaves us with 38.
Bring next digit (8) of the dividend behind the 38 and repeat the process: 388 / 90

On to step 3:
388 divided by 90 is 4 with a remainder of 28.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 360 from 388 and we're left with 28.
Append the next digit (7) from the dividend to 28 and continue with: 287 / 90

On to step 4:
When dividing 287 by 90, we get 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 43.0
Subtracting 270 from 287 leaves us with 17.
Grab the next digit (6) from the dividend, add it to 17, then carry on: 176 / 90

Moving on to step 5:
If we divide 176 by 90, we get 1 and a remainder of 86.
Write down 1 as next digit of the result. 
Result so far: 431.0
If we take 90 away from 176, we end up with 86.
Take the next digit (4) from the dividend and append it to 86, then repeat: 864 / 90

Moving on to step 6:
When dividing 864 by 90, we get 9 with a remainder of 54.
Put 9 as the next digit of the answer. 
Result so far: 4319.0
Subtract 810 from 864 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 7:
The number 90 fits into 540 6 times, leaving a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 4319.6
The remainder is 0 after subtracting 540 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
If we divide 0 by 90, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4319.6
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
If we divide 0 by 90, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4319.6
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 4319.6, and the remainder is 0.0.