Let's divide 18651860 by 521
We're looking to find how many times 521 goes into 18651860.

Going ahead to step 1:
The number 521 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 521

Step 2:
The number 521 fits into 18 0 times, leaving a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 18, we get 18.
Take the next digit (6) from the dividend and append it to 18, then repeat: 186 / 521

On to step 3:
521 goes into 186 0 times with a remainder of 186.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 186 leaves us with 186.
Take the next digit (5) from the dividend and append it to 186, then repeat: 1865 / 521

Let's proceed to step 4:
When dividing 1865 by 521, we get 3 with a remainder of 302.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 1563 from 1865, we get 302.
Bring next digit (1) of the dividend behind the 302 and repeat the process: 3021 / 521

Advancing to step 5:
521 can be fit into 3021 5 times, resulting in a remainder of 416.
Write down 5 as next digit of the result. 
Result so far: 35.0
If we take 2605 away from 3021, we end up with 416.
Fetch the next digit (8) from the dividend, attach it to 416 and continue: 4168 / 521

Let's proceed to step 6:
When dividing 4168 by 521, we get 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 358.0
Subtract 4168 from 4168 to get 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 521

Let's proceed to step 7:
If we divide 6 by 521, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 3580.0
Subtract 0 from 6 to get 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 521

Moving on to step 8:
60 divided by 521 is 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 35800.0
The remainder is 60 after subtracting 0 from 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 9:
When dividing 600 by 521, we get 1 with a remainder of 79.
The number 1 becomes the next digit in our result. 
Result so far: 35800.1
Subtracting 521 from 600 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Advancing to step 10:
790 divided by 521 is 1 with a remainder of 269.
The next digit of our result is 1. 
Result so far: 35800.11
If we take 521 away from 790, we end up with 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

The final result is 35800.11 with a remainder of 0.269.