We divide 645070 by 90
We want to divide 645070 by 90.

Moving on to step 1:
90 goes into 6 0 times with 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.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 90

Let's proceed to step 2:
64 divided by 90 is 0 with a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Append the next digit (5) from the dividend to 64 and continue with: 645 / 90

Step 3:
645 divided by 90 is 7 with a remainder of 15.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 630 away from 645, we end up with 15.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 90

Going ahead to step 4:
If we divide 150 by 90, we get 1 and a remainder of 60.
Record the quotient 1 as the next digit in the result. 
Result so far: 71.0
If we subtract 90 from 150, we get 60.
Take the next digit (7) from the dividend and append it to 60, then repeat: 607 / 90

Let's proceed to step 5:
607 divided by 90 is 6 with a remainder of 67.
The next digit of our result is 6. 
Result so far: 716.0
Subtracting 540 from 607 leaves us with 67.
Grab the next digit (0) from the dividend, add it to 67, then carry on: 670 / 90

Going ahead to step 6:
When dividing 670 by 90, we get 7 with a remainder of 40.
The next digit of our result is 7. 
Result so far: 7167.0
The remainder is 40 after subtracting 630 from 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead 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: 7167.4
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.

Advancing to step 8:
The number 90 fits into 400 4 times, leaving a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 7167.44
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.

After the division, we end up with 7167.44 and a remainder of 0.04.