We're dividing 31638091 by 90 
We're looking to find how many times 90 goes into 31638091.

On to step 1:
90 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 90

Let's proceed to step 2:
The number 90 fits into 31 0 times, leaving a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 31 and we're left with 31.
Grab the next digit (6) from the dividend, add it to 31, then carry on: 316 / 90

Going ahead to step 3:
316 divided by 90 is 3 with a remainder of 46.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 270 from 316 to get 46.
Grab the next digit (3) from the dividend, add it to 46, then carry on: 463 / 90

Going ahead to step 4:
If we divide 463 by 90, we get 5 and a remainder of 13.
Put 5 as the next digit of the answer. 
Result so far: 35.0
Deduct 450 from 463 and we're left with 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 90

Moving on to step 5:
If we divide 138 by 90, we get 1 and a remainder of 48.
Use 1 as the next digit of our solution. 
Result so far: 351.0
If we take 90 away from 138, we end up with 48.
Append the next digit (0) from the dividend to 48 and continue with: 480 / 90

Let's proceed to step 6:
90 goes into 480 5 times with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 3515.0
Deduct 450 from 480 and we're left with 30.
Grab the next digit (9) from the dividend, add it to 30, then carry on: 309 / 90

Let's proceed to step 7:
90 can be fit into 309 3 times, resulting in a remainder of 39.
Put 3 as the next digit of the answer. 
Result so far: 35153.0
If we subtract 270 from 309, we get 39.
Bring next digit (1) of the dividend behind the 39 and repeat the process: 391 / 90

Let's proceed to step 8:
When dividing 391 by 90, we get 4 with a remainder of 31.
Put 4 as the next digit of the answer. 
Result so far: 351534.0
The remainder is 31 after subtracting 360 from 391.
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 9:
90 goes into 310 3 times with a remainder of 40.
Put 3 as the next digit of the answer. 
Result so far: 351534.3
If we subtract 270 from 310, we 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.

Advancing to step 10:
If we divide 400 by 90, we get 4 and a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 351534.34
The remainder is 40 after subtracting 360 from 400.
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 11:
400 divided by 90 is 4 with a remainder of 40.
The next digit of our result is 4. 
Result so far: 351534.344
Deduct 360 from 400 and we're left 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.

After the division, we end up with 351534.344 and a remainder of 0.004.