353821 ÷ 90 
Let's see how many times 90 fits into 353821.

Advancing to step 1:
If we divide 3 by 90, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 90

Advancing to step 2:
If we divide 35 by 90, we get 0 and a remainder of 35.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 35 after subtracting 0 from 35.
Fetch the next digit (3) from the dividend, attach it to 35 and continue: 353 / 90

Advancing to step 3:
If we divide 353 by 90, we get 3 and a remainder of 83.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 270 from 353 to get 83.
Grab the next digit (8) from the dividend, add it to 83, then carry on: 838 / 90

Step 4:
When dividing 838 by 90, we get 9 with a remainder of 28.
Put 9 as the next digit of the answer. 
Result so far: 39.0
The remainder is 28 after subtracting 810 from 838.
Append the next digit (2) from the dividend to 28 and continue with: 282 / 90

Advancing to step 5:
90 can be fit into 282 3 times, resulting in a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 393.0
The remainder is 12 after subtracting 270 from 282.
Bring next digit (1) of the dividend behind the 12 and repeat the process: 121 / 90

Step 6:
121 divided by 90 is 1 with a remainder of 31.
The next digit of our result is 1. 
Result so far: 3931.0
The remainder is 31 after subtracting 90 from 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 7:
When dividing 310 by 90, we get 3 with a remainder of 40.
The number 3 becomes the next digit in our result. 
Result so far: 3931.3
The remainder is 40 after subtracting 270 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
90 can be fit into 400 4 times, resulting in a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 3931.34
If we take 360 away from 400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 9:
When dividing 400 by 90, we get 4 with a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 3931.344
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 3931.344, with a leftover of 0.004.