We look at the division of 18390790 by 521 
We want to divide 18390790 by 521.

Moving on to step 1:
The number 521 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 521

Let's proceed to step 2:
When dividing 18 by 521, we get 0 with a remainder of 18.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 18, we get 18.
Include the next digit (3) from the dividend after 18, then repeat: 183 / 521

Step 3:
521 goes into 183 0 times with a remainder of 183.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 183 and we're left with 183.
Bring next digit (9) of the dividend behind the 183 and repeat the process: 1839 / 521

Step 4:
The number 521 fits into 1839 3 times, leaving a remainder of 276.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 1563 from 1839 to get 276.
Append the next digit (0) from the dividend to 276 and continue with: 2760 / 521

Moving on to step 5:
521 goes into 2760 5 times with a remainder of 155.
Record the quotient 5 as the next digit in the result. 
Result so far: 35.0
If we take 2605 away from 2760, we end up with 155.
Fetch the next digit (7) from the dividend, attach it to 155 and continue: 1557 / 521

Let's proceed to step 6:
1557 divided by 521 is 2 with a remainder of 515.
Put 2 as the next digit of the answer. 
Result so far: 352.0
If we subtract 1042 from 1557, we get 515.
Bring next digit (9) of the dividend behind the 515 and repeat the process: 5159 / 521

Moving on to step 7:
If we divide 5159 by 521, we get 9 and a remainder of 470.
The next digit of our result is 9. 
Result so far: 3529.0
If we take 4689 away from 5159, we end up with 470.
Take the next digit (0) from the dividend and append it to 470, then repeat: 4700 / 521

On to step 8:
The number 521 fits into 4700 9 times, leaving a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 35299.0
If we take 4689 away from 4700, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 9:
110 divided by 521 is 0 with a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 35299.0
Subtracting 0 from 110 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Let's proceed to step 10:
521 can be fit into 1100 2 times, resulting in a remainder of 58.
Use 2 as the next digit of our solution. 
Result so far: 35299.02
The remainder is 58 after subtracting 1042 from 1100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 11:
When dividing 580 by 521, we get 1 with a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 35299.021
Deduct 521 from 580 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 12:
If we divide 590 by 521, we get 1 and a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 35299.0211
If we subtract 521 from 590, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

In conclusion, the division gives 35299.0211 with a balance of 0.00069.