Let's divide 660138 by 90
We're looking to find how many times 90 goes into 660138.

Advancing to step 1:
If we divide 6 by 90, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 90

Advancing to step 2:
When dividing 66 by 90, we get 0 with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Append the next digit (0) from the dividend to 66 and continue with: 660 / 90

On to step 3:
The number 90 fits into 660 7 times, leaving a remainder of 30.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Deduct 630 from 660 and we're left with 30.
Grab the next digit (1) from the dividend, add it to 30, then carry on: 301 / 90

Let's proceed to step 4:
301 divided by 90 is 3 with a remainder of 31.
Use 3 as the next digit of our solution. 
Result so far: 73.0
The remainder is 31 after subtracting 270 from 301.
Append the next digit (3) from the dividend to 31 and continue with: 313 / 90

Moving on to step 5:
If we divide 313 by 90, we get 3 and a remainder of 43.
Record the quotient 3 as the next digit in the result. 
Result so far: 733.0
Subtract 270 from 313 to get 43.
Take the next digit (8) from the dividend and append it to 43, then repeat: 438 / 90

Let's proceed to step 6:
The number 90 fits into 438 4 times, leaving a remainder of 78.
The number 4 becomes the next digit in our result. 
Result so far: 7334.0
If we take 360 away from 438, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 7:
If we divide 780 by 90, we get 8 and a remainder of 60.
Write down 8 as next digit of the result. 
Result so far: 7334.8
If we subtract 720 from 780, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 8:
90 goes into 600 6 times with a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 7334.86
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 7334.866
Subtract 540 from 600 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

After the division, we end up with 7334.866 and a remainder of 0.006.