139432 ÷ 90 
Let's see how many times 90 fits into 139432.

Step 1:
If we divide 1 by 90, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 90

Going ahead to step 2:
When dividing 13 by 90, we get 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Fetch the next digit (9) from the dividend, attach it to 13 and continue: 139 / 90

Step 3:
The number 90 fits into 139 1 times, leaving a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 90 from 139, we get 49.
Grab the next digit (4) from the dividend, add it to 49, then carry on: 494 / 90

Advancing to step 4:
The number 90 fits into 494 5 times, leaving a remainder of 44.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we subtract 450 from 494, we get 44.
Append the next digit (3) from the dividend to 44 and continue with: 443 / 90

Let's proceed to step 5:
90 can be fit into 443 4 times, resulting in a remainder of 83.
Put 4 as the next digit of the answer. 
Result so far: 154.0
The remainder is 83 after subtracting 360 from 443.
Take the next digit (2) from the dividend and append it to 83, then repeat: 832 / 90

Step 6:
When dividing 832 by 90, we get 9 with a remainder of 22.
The next digit of our result is 9. 
Result so far: 1549.0
If we subtract 810 from 832, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 7:
90 can be fit into 220 2 times, resulting in a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 1549.2
Deduct 180 from 220 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.

Step 8:
The number 90 fits into 400 4 times, leaving a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 1549.24
Subtracting 360 from 400 leaves us 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.

Let's proceed to step 9:
If we divide 400 by 90, we get 4 and a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 1549.244
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.

After the division, we end up with 1549.244 and a remainder of 0.004.