We look at the division of 646548 by 90 
We want to divide 646548 by 90.

Let's proceed to step 1:
The number 90 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 90

Advancing to step 2:
When dividing 64 by 90, we get 0 with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Take the next digit (6) from the dividend and append it to 64, then repeat: 646 / 90

On to step 3:
646 divided by 90 is 7 with a remainder of 16.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 630 from 646 leaves us with 16.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 90

Step 4:
If we divide 165 by 90, we get 1 and a remainder of 75.
Record the quotient 1 as the next digit in the result. 
Result so far: 71.0
If we subtract 90 from 165, we get 75.
Append the next digit (4) from the dividend to 75 and continue with: 754 / 90

Going ahead to step 5:
The number 90 fits into 754 8 times, leaving a remainder of 34.
The next digit of our result is 8. 
Result so far: 718.0
Subtracting 720 from 754 leaves us with 34.
Grab the next digit (8) from the dividend, add it to 34, then carry on: 348 / 90

Moving on to step 6:
90 goes into 348 3 times with a remainder of 78.
The number 3 becomes the next digit in our result. 
Result so far: 7183.0
Subtract 270 from 348 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Step 7:
When dividing 780 by 90, we get 8 with a remainder of 60.
The next digit of our result is 8. 
Result so far: 7183.8
Subtracting 720 from 780 leaves us with 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:
If we divide 600 by 90, we get 6 and a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 7183.86
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.

On to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
The next digit of our result is 6. 
Result so far: 7183.866
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The quotient of the division is 7183.866, and the remainder is 0.006.