31597 ÷ 90 
We want to divide 31597 by 90.

Let's proceed to step 1:
If we divide 3 by 90, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 90

On 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.
Take the next digit (5) from the dividend and append it to 31, then repeat: 315 / 90

Step 3:
315 divided by 90 is 3 with a remainder of 45.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 45 after subtracting 270 from 315.
Append the next digit (9) from the dividend to 45 and continue with: 459 / 90

Let's proceed to step 4:
When dividing 459 by 90, we get 5 with a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 35.0
Deduct 450 from 459 and we're left with 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 90

Moving on to step 5:
97 divided by 90 is 1 with a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 351.0
If we subtract 90 from 97, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 6:
70 divided by 90 is 0 with a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 351.0
If we take 0 away from 70, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 7:
90 goes into 700 7 times with a remainder of 70.
The next digit of our result is 7. 
Result so far: 351.07
If we subtract 630 from 700, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 8:
If we divide 700 by 90, we get 7 and a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 351.077
Subtract 630 from 700 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 351.077, with a leftover of 0.007.