We divide 2640640 by 520
The aim is to understand the frequency of 520 in 2640640.

Step 1:
520 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 520

Moving on to step 2:
520 goes into 26 0 times with a remainder of 26.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 26, we end up with 26.
Bring next digit (4) of the dividend behind the 26 and repeat the process: 264 / 520

Step 3:
520 can be fit into 264 0 times, resulting in a remainder of 264.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 264 and we're left with 264.
Fetch the next digit (0) from the dividend, attach it to 264 and continue: 2640 / 520

Advancing to step 4:
If we divide 2640 by 520, we get 5 and a remainder of 40.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 2600 from 2640 and we're left with 40.
Fetch the next digit (6) from the dividend, attach it to 40 and continue: 406 / 520

Moving on to step 5:
406 divided by 520 is 0 with a remainder of 406.
Use 0 as the next digit of our solution. 
Result so far: 50.0
Subtracting 0 from 406 leaves us with 406.
Append the next digit (4) from the dividend to 406 and continue with: 4064 / 520

Advancing to step 6:
4064 divided by 520 is 7 with a remainder of 424.
Put 7 as the next digit of the answer. 
Result so far: 507.0
Deduct 3640 from 4064 and we're left with 424.
Include the next digit (0) from the dividend after 424, then repeat: 4240 / 520

Going ahead to step 7:
The number 520 fits into 4240 8 times, leaving a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 5078.0
Deduct 4160 from 4240 and we're left 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.

Step 8:
800 divided by 520 is 1 with a remainder of 280.
Use 1 as the next digit of our solution. 
Result so far: 5078.1
Subtracting 520 from 800 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Going ahead to step 9:
The number 520 fits into 2800 5 times, leaving a remainder of 200.
Put 5 as the next digit of the answer. 
Result so far: 5078.15
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.

Going ahead to step 10:
2000 divided by 520 is 3 with a remainder of 440.
The number 3 becomes the next digit in our result. 
Result so far: 5078.153
Deduct 1560 from 2000 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.

Advancing to step 11:
520 can be fit into 4400 8 times, resulting in a remainder of 240.
The next digit of our result is 8. 
Result so far: 5078.1538
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.

On to step 12:
If we divide 2400 by 520, we get 4 and a remainder of 320.
Put 4 as the next digit of the answer. 
Result so far: 5078.15384
Subtracting 2080 from 2400 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 13:
520 goes into 3200 6 times with a remainder of 80.
Put 6 as the next digit of the answer. 
Result so far: 5078.153846
The remainder is 80 after subtracting 3120 from 3200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 14:
When dividing 800 by 520, we get 1 with a remainder of 280.
Use 1 as the next digit of our solution. 
Result so far: 5078.1538461
Deduct 520 from 800 and we're left with 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 15:
2800 divided by 520 is 5 with a remainder of 200.
Write down 5 as next digit of the result. 
Result so far: 5078.15384615
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.

The final outcome is 5078.15384615, with a leftover of 2e-07.