845421 divided by 90 
We want to figure out the number of times 845421 can be divided by 90.

Moving on to step 1:
90 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 90

Moving on to step 2:
90 goes into 84 0 times with a remainder of 84.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 84 leaves us with 84.
Take the next digit (5) from the dividend and append it to 84, then repeat: 845 / 90

Let's proceed to step 3:
If we divide 845 by 90, we get 9 and a remainder of 35.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we take 810 away from 845, we end up with 35.
Grab the next digit (4) from the dividend, add it to 35, then carry on: 354 / 90

Step 4:
When dividing 354 by 90, we get 3 with a remainder of 84.
Put 3 as the next digit of the answer. 
Result so far: 93.0
If we subtract 270 from 354, we get 84.
Take the next digit (2) from the dividend and append it to 84, then repeat: 842 / 90

On to step 5:
If we divide 842 by 90, we get 9 and a remainder of 32.
The next digit of our result is 9. 
Result so far: 939.0
The remainder is 32 after subtracting 810 from 842.
Grab the next digit (1) from the dividend, add it to 32, then carry on: 321 / 90

Step 6:
90 can be fit into 321 3 times, resulting in a remainder of 51.
Write down 3 as next digit of the result. 
Result so far: 9393.0
If we take 270 away from 321, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 7:
510 divided by 90 is 5 with a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 9393.5
Subtracting 450 from 510 leaves us 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 8:
When dividing 600 by 90, we get 6 with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 9393.56
Subtract 540 from 600 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
90 goes into 600 6 times with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 9393.566
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

After the division, we end up with 9393.566 and a remainder of 0.006.