Let's divide 8721053 by 403
We want to figure out the number of times 8721053 can be divided by 403.

Moving on to step 1:
If we divide 8 by 403, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 403

Moving on to step 2:
403 can be fit into 87 0 times, resulting in a remainder of 87.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 87, we get 87.
Append the next digit (2) from the dividend to 87 and continue with: 872 / 403

Advancing to step 3:
If we divide 872 by 403, we get 2 and a remainder of 66.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 806 from 872 and we're left with 66.
Bring next digit (1) of the dividend behind the 66 and repeat the process: 661 / 403

On to step 4:
403 can be fit into 661 1 times, resulting in a remainder of 258.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
The remainder is 258 after subtracting 403 from 661.
Include the next digit (0) from the dividend after 258, then repeat: 2580 / 403

Advancing to step 5:
If we divide 2580 by 403, we get 6 and a remainder of 162.
Record the quotient 6 as the next digit in the result. 
Result so far: 216.0
Subtract 2418 from 2580 to get 162.
Include the next digit (5) from the dividend after 162, then repeat: 1625 / 403

Going ahead to step 6:
If we divide 1625 by 403, we get 4 and a remainder of 13.
Record the quotient 4 as the next digit in the result. 
Result so far: 2164.0
Deduct 1612 from 1625 and we're left with 13.
Take the next digit (3) from the dividend and append it to 13, then repeat: 133 / 403

Advancing to step 7:
If we divide 133 by 403, we get 0 and a remainder of 133.
Write down 0 as next digit of the result. 
Result so far: 21640.0
Subtracting 0 from 133 leaves us with 133.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1330, and continue the process.

Step 8:
When dividing 1330 by 403, we get 3 with a remainder of 121.
Write down 3 as next digit of the result. 
Result so far: 21640.3
Subtracting 1209 from 1330 leaves us with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

On to step 9:
The number 403 fits into 1210 3 times, leaving a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 21640.33
Deduct 1209 from 1210 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Our division results in 21640.33 with a remaining 0.001.