64543 divided by 90 
Let's see how many times 90 fits into 64543.

Step 1:
When dividing 6 by 90, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
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

Going ahead to step 2:
64 divided by 90 is 0 with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Include the next digit (5) from the dividend after 64, then repeat: 645 / 90

Moving on to step 3:
If we divide 645 by 90, we get 7 and a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Deduct 630 from 645 and we're left with 15.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 90

Let's proceed to step 4:
The number 90 fits into 154 1 times, leaving a remainder of 64.
Use 1 as the next digit of our solution. 
Result so far: 71.0
Subtracting 90 from 154 leaves us with 64.
Take the next digit (3) from the dividend and append it to 64, then repeat: 643 / 90

Advancing to step 5:
When dividing 643 by 90, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 717.0
The remainder is 13 after subtracting 630 from 643.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 6:
90 can be fit into 130 1 times, resulting in a remainder of 40.
Record the quotient 1 as the next digit in the result. 
Result so far: 717.1
Deduct 90 from 130 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.

Let's proceed to step 7:
The number 90 fits into 400 4 times, leaving a remainder of 40.
The next digit of our result is 4. 
Result so far: 717.14
Deduct 360 from 400 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.

On to step 8:
400 divided by 90 is 4 with a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 717.144
If we subtract 360 from 400, we 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.

The final result is 717.144 with a remainder of 0.004.