We divide 669663 by 90
Our goal is to divide 669663 by 90.

Moving on to step 1:
6 divided by 90 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 90

Step 2:
66 divided by 90 is 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (9) from the dividend after 66, then repeat: 669 / 90

Step 3:
90 goes into 669 7 times with a remainder of 39.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtract 630 from 669 to get 39.
Append the next digit (6) from the dividend to 39 and continue with: 396 / 90

Let's proceed to step 4:
90 can be fit into 396 4 times, resulting in a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 74.0
The remainder is 36 after subtracting 360 from 396.
Grab the next digit (6) from the dividend, add it to 36, then carry on: 366 / 90

Step 5:
When dividing 366 by 90, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 744.0
Deduct 360 from 366 and we're left with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 90

Going ahead to step 6:
90 can be fit into 63 0 times, resulting in a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 7440.0
Subtract 0 from 63 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 7:
90 can be fit into 630 7 times, resulting in a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 7440.7
If we subtract 630 from 630, we 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.

Step 8:
The number 90 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 7440.7
If we subtract 0 from 0, we 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.

Going ahead to step 9:
If we divide 0 by 90, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 7440.7
The remainder is 0 after subtracting 0 from 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 result is 7440.7 with a remainder of 0.0.