We look at the division of 621324 by 90 
We want to figure out the number of times 621324 can be divided by 90.

Moving on to step 1:
If we divide 6 by 90, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 90

Advancing to step 2:
When dividing 62 by 90, we get 0 with a remainder of 62.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 62 and we're left with 62.
Take the next digit (1) from the dividend and append it to 62, then repeat: 621 / 90

Moving on to step 3:
When dividing 621 by 90, we get 6 with a remainder of 81.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we subtract 540 from 621, we get 81.
Grab the next digit (3) from the dividend, add it to 81, then carry on: 813 / 90

Step 4:
The number 90 fits into 813 9 times, leaving a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 69.0
Deduct 810 from 813 and we're left with 3.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 90

Advancing to step 5:
If we divide 32 by 90, we get 0 and a remainder of 32.
Write down 0 as next digit of the result. 
Result so far: 690.0
The remainder is 32 after subtracting 0 from 32.
Bring next digit (4) of the dividend behind the 32 and repeat the process: 324 / 90

Moving on to step 6:
If we divide 324 by 90, we get 3 and a remainder of 54.
Use 3 as the next digit of our solution. 
Result so far: 6903.0
Subtract 270 from 324 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.

On to step 7:
540 divided by 90 is 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 6903.6
If we take 540 away from 540, 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.

Moving on to step 8:
90 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 6903.6
Subtracting 0 from 0 leaves us 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.

Going ahead to step 9:
0 divided by 90 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 6903.6
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.

The final result is 6903.6 with a remainder of 0.0.