Let's divide 20000521 by 415
The aim is to understand the frequency of 415 in 20000521.

On to step 1:
415 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 415

Let's proceed to step 2:
20 divided by 415 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 20, we get 20.
Bring next digit (0) of the dividend behind the 20 and repeat the process: 200 / 415

On to step 3:
415 goes into 200 0 times with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 200 after subtracting 0 from 200.
Append the next digit (0) from the dividend to 200 and continue with: 2000 / 415

Let's proceed to step 4:
2000 divided by 415 is 4 with a remainder of 340.
The next digit of our result is 4. 
Result so far: 4.0
If we take 1660 away from 2000, we end up with 340.
Append the next digit (0) from the dividend to 340 and continue with: 3400 / 415

Step 5:
3400 divided by 415 is 8 with a remainder of 80.
The next digit of our result is 8. 
Result so far: 48.0
Deduct 3320 from 3400 and we're left with 80.
Fetch the next digit (5) from the dividend, attach it to 80 and continue: 805 / 415

Step 6:
415 goes into 805 1 times with a remainder of 390.
The next digit of our result is 1. 
Result so far: 481.0
The remainder is 390 after subtracting 415 from 805.
Bring next digit (2) of the dividend behind the 390 and repeat the process: 3902 / 415

Going ahead to step 7:
If we divide 3902 by 415, we get 9 and a remainder of 167.
Record the quotient 9 as the next digit in the result. 
Result so far: 4819.0
If we take 3735 away from 3902, we end up with 167.
Grab the next digit (1) from the dividend, add it to 167, then carry on: 1671 / 415

Going ahead to step 8:
When dividing 1671 by 415, we get 4 with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 48194.0
If we take 1660 away from 1671, 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:
When dividing 110 by 415, we get 0 with a remainder of 110.
Record the quotient 0 as the next digit in the result. 
Result so far: 48194.0
Deduct 0 from 110 and we're left 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.

Advancing to step 10:
415 goes into 1100 2 times with a remainder of 270.
The next digit of our result is 2. 
Result so far: 48194.02
If we take 830 away from 1100, we end up with 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Moving on to step 11:
The number 415 fits into 2700 6 times, leaving a remainder of 210.
Put 6 as the next digit of the answer. 
Result so far: 48194.026
Subtracting 2490 from 2700 leaves us with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Moving on to step 12:
The number 415 fits into 2100 5 times, leaving a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 48194.0265
The remainder is 25 after subtracting 2075 from 2100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 13:
When dividing 250 by 415, we get 0 with a remainder of 250.
Use 0 as the next digit of our solution. 
Result so far: 48194.0265
Subtract 0 from 250 to get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Let's proceed to step 14:
If we divide 2500 by 415, we get 6 and a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 48194.026506
Deduct 2490 from 2500 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 15:
415 can be fit into 100 0 times, resulting in a remainder of 100.
The number 0 becomes the next digit in our result. 
Result so far: 48194.026506
If we subtract 0 from 100, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 16:
415 goes into 1000 2 times with a remainder of 170.
Use 2 as the next digit of our solution. 
Result so far: 48194.02650602
If we subtract 830 from 1000, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

After the division, we end up with 48194.02650602 and a remainder of 1.7e-07.