Let's divide 871090 by 45
We want to figure out the number of times 871090 can be divided by 45.

Step 1:
8 divided by 45 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 45

Going ahead to step 2:
The number 45 fits into 87 1 times, leaving a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 45 from 87 and we're left with 42.
Bring next digit (1) of the dividend behind the 42 and repeat the process: 421 / 45

Moving on to step 3:
45 goes into 421 9 times with a remainder of 16.
Put 9 as the next digit of the answer. 
Result so far: 19.0
If we take 405 away from 421, we end up with 16.
Bring next digit (0) of the dividend behind the 16 and repeat the process: 160 / 45

Moving on to step 4:
160 divided by 45 is 3 with a remainder of 25.
The number 3 becomes the next digit in our result. 
Result so far: 193.0
The remainder is 25 after subtracting 135 from 160.
Fetch the next digit (9) from the dividend, attach it to 25 and continue: 259 / 45

Let's proceed to step 5:
If we divide 259 by 45, we get 5 and a remainder of 34.
The number 5 becomes the next digit in our result. 
Result so far: 1935.0
Subtract 225 from 259 to get 34.
Include the next digit (0) from the dividend after 34, then repeat: 340 / 45

Step 6:
The number 45 fits into 340 7 times, leaving a remainder of 25.
Write down 7 as next digit of the result. 
Result so far: 19357.0
If we take 315 away from 340, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 7:
250 divided by 45 is 5 with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 19357.5
Deduct 225 from 250 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 8:
250 divided by 45 is 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 19357.55
The remainder is 25 after subtracting 225 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final result is 19357.55 with a remainder of 0.025.