18358904 divided by 520 
The aim is to understand the frequency of 520 in 18358904.

Going ahead to step 1:
520 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 520

Advancing to step 2:
The number 520 fits into 18 0 times, leaving a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Include the next digit (3) from the dividend after 18, then repeat: 183 / 520

Going ahead to step 3:
183 divided by 520 is 0 with a remainder of 183.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 183, we get 183.
Include the next digit (5) from the dividend after 183, then repeat: 1835 / 520

Going ahead to step 4:
The number 520 fits into 1835 3 times, leaving a remainder of 275.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 1560 from 1835 and we're left with 275.
Grab the next digit (8) from the dividend, add it to 275, then carry on: 2758 / 520

Going ahead to step 5:
520 can be fit into 2758 5 times, resulting in a remainder of 158.
The next digit of our result is 5. 
Result so far: 35.0
If we subtract 2600 from 2758, we get 158.
Fetch the next digit (9) from the dividend, attach it to 158 and continue: 1589 / 520

Let's proceed to step 6:
1589 divided by 520 is 3 with a remainder of 29.
Record the quotient 3 as the next digit in the result. 
Result so far: 353.0
If we take 1560 away from 1589, we end up with 29.
Append the next digit (0) from the dividend to 29 and continue with: 290 / 520

On to step 7:
If we divide 290 by 520, we get 0 and a remainder of 290.
Write down 0 as next digit of the result. 
Result so far: 3530.0
Subtract 0 from 290 to get 290.
Append the next digit (4) from the dividend to 290 and continue with: 2904 / 520

Advancing to step 8:
520 goes into 2904 5 times with a remainder of 304.
Put 5 as the next digit of the answer. 
Result so far: 35305.0
The remainder is 304 after subtracting 2600 from 2904.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Advancing to step 9:
520 can be fit into 3040 5 times, resulting in a remainder of 440.
Put 5 as the next digit of the answer. 
Result so far: 35305.5
Deduct 2600 from 3040 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Step 10:
If we divide 4400 by 520, we get 8 and a remainder of 240.
The number 8 becomes the next digit in our result. 
Result so far: 35305.58
The remainder is 240 after subtracting 4160 from 4400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 11:
2400 divided by 520 is 4 with a remainder of 320.
Record the quotient 4 as the next digit in the result. 
Result so far: 35305.584
The remainder is 320 after subtracting 2080 from 2400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Going ahead to step 12:
If we divide 3200 by 520, we get 6 and a remainder of 80.
Use 6 as the next digit of our solution. 
Result so far: 35305.5846
If we take 3120 away from 3200, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 13:
If we divide 800 by 520, we get 1 and a remainder of 280.
Put 1 as the next digit of the answer. 
Result so far: 35305.58461
If we subtract 520 from 800, we get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 14:
520 can be fit into 2800 5 times, resulting in a remainder of 200.
The number 5 becomes the next digit in our result. 
Result so far: 35305.584615
Subtract 2600 from 2800 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 15:
520 goes into 2000 3 times with a remainder of 440.
Record the quotient 3 as the next digit in the result. 
Result so far: 35305.5846153
Subtracting 1560 from 2000 leaves us with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Advancing to step 16:
When dividing 4400 by 520, we get 8 with a remainder of 240.
The next digit of our result is 8. 
Result so far: 35305.58461538
Subtract 4160 from 4400 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The final result is 35305.58461538 with a remainder of 2.4e-07.