We're dividing 307159 by 90 
We want to figure out the number of times 307159 can be divided by 90.

Step 1:
90 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 90

On to step 2:
When dividing 30 by 90, we get 0 with a remainder of 30.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 30 leaves us with 30.
Include the next digit (7) from the dividend after 30, then repeat: 307 / 90

Advancing to step 3:
The number 90 fits into 307 3 times, leaving a remainder of 37.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 270 from 307 and we're left with 37.
Fetch the next digit (1) from the dividend, attach it to 37 and continue: 371 / 90

On to step 4:
The number 90 fits into 371 4 times, leaving a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
If we subtract 360 from 371, we get 11.
Append the next digit (5) from the dividend to 11 and continue with: 115 / 90

Step 5:
90 can be fit into 115 1 times, resulting in a remainder of 25.
Record the quotient 1 as the next digit in the result. 
Result so far: 341.0
Subtract 90 from 115 to get 25.
Include the next digit (9) from the dividend after 25, then repeat: 259 / 90

Going ahead to step 6:
90 can be fit into 259 2 times, resulting in a remainder of 79.
The number 2 becomes the next digit in our result. 
Result so far: 3412.0
Deduct 180 from 259 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 7:
If we divide 790 by 90, we get 8 and a remainder of 70.
The next digit of our result is 8. 
Result so far: 3412.8
Deduct 720 from 790 and we're left 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.

Going ahead to step 8:
90 goes into 700 7 times with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 3412.87
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.

Going ahead to step 9:
90 goes into 700 7 times with a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 3412.877
Deduct 630 from 700 and we're left 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.

After the division, we end up with 3412.877 and a remainder of 0.007.