We're dividing 158590 by 16 
We want to divide 158590 by 16.

Advancing to step 1:
16 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 16

Moving on to step 2:
The number 16 fits into 15 0 times, leaving a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 16

Let's proceed to step 3:
The number 16 fits into 158 9 times, leaving a remainder of 14.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we take 144 away from 158, we end up with 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 16

Moving on to step 4:
When dividing 145 by 16, we get 9 with a remainder of 1.
The next digit of our result is 9. 
Result so far: 99.0
If we subtract 144 from 145, we get 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 16

Moving on to step 5:
If we divide 19 by 16, we get 1 and a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 991.0
If we subtract 16 from 19, we get 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 16

Step 6:
When dividing 30 by 16, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 9911.0
Deduct 16 from 30 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
140 divided by 16 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 9911.8
If we subtract 128 from 140, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
16 goes into 120 7 times with a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 9911.87
The remainder is 8 after subtracting 112 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
When dividing 80 by 16, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 9911.875
The remainder is 0 after subtracting 80 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
If we divide 0 by 16, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 9911.875
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
16 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9911.875
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 9911.875, with a leftover of 0.0.