We're dividing 21308026 by 260 
The aim is to understand the frequency of 260 in 21308026.

Step 1:
When dividing 2 by 260, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 260

Advancing to step 2:
260 goes into 21 0 times with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (3) from the dividend to 21 and continue with: 213 / 260

Moving on to step 3:
260 can be fit into 213 0 times, resulting in a remainder of 213.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 213 after subtracting 0 from 213.
Append the next digit (0) from the dividend to 213 and continue with: 2130 / 260

Going ahead to step 4:
260 goes into 2130 8 times with a remainder of 50.
The next digit of our result is 8. 
Result so far: 8.0
Subtracting 2080 from 2130 leaves us with 50.
Take the next digit (8) from the dividend and append it to 50, then repeat: 508 / 260

Moving on to step 5:
260 can be fit into 508 1 times, resulting in a remainder of 248.
Put 1 as the next digit of the answer. 
Result so far: 81.0
The remainder is 248 after subtracting 260 from 508.
Fetch the next digit (0) from the dividend, attach it to 248 and continue: 2480 / 260

Step 6:
260 goes into 2480 9 times with a remainder of 140.
Record the quotient 9 as the next digit in the result. 
Result so far: 819.0
Subtracting 2340 from 2480 leaves us with 140.
Take the next digit (2) from the dividend and append it to 140, then repeat: 1402 / 260

On to step 7:
260 goes into 1402 5 times with a remainder of 102.
Record the quotient 5 as the next digit in the result. 
Result so far: 8195.0
If we take 1300 away from 1402, we end up with 102.
Append the next digit (6) from the dividend to 102 and continue with: 1026 / 260

Advancing to step 8:
The number 260 fits into 1026 3 times, leaving a remainder of 246.
Write down 3 as next digit of the result. 
Result so far: 81953.0
Subtracting 780 from 1026 leaves us with 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Going ahead to step 9:
When dividing 2460 by 260, we get 9 with a remainder of 120.
Write down 9 as next digit of the result. 
Result so far: 81953.9
Subtracting 2340 from 2460 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 10:
When dividing 1200 by 260, we get 4 with a remainder of 160.
Write down 4 as next digit of the result. 
Result so far: 81953.94
The remainder is 160 after subtracting 1040 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 11:
The number 260 fits into 1600 6 times, leaving a remainder of 40.
The number 6 becomes the next digit in our result. 
Result so far: 81953.946
Subtracting 1560 from 1600 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 12:
When dividing 400 by 260, we get 1 with a remainder of 140.
The number 1 becomes the next digit in our result. 
Result so far: 81953.9461
Deduct 260 from 400 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Moving on to step 13:
The number 260 fits into 1400 5 times, leaving a remainder of 100.
Put 5 as the next digit of the answer. 
Result so far: 81953.94615
If we take 1300 away from 1400, we end up with 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 14:
1000 divided by 260 is 3 with a remainder of 220.
Put 3 as the next digit of the answer. 
Result so far: 81953.946153
If we subtract 780 from 1000, we get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 15:
When dividing 2200 by 260, we get 8 with a remainder of 120.
The number 8 becomes the next digit in our result. 
Result so far: 81953.9461538
If we subtract 2080 from 2200, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 16:
1200 divided by 260 is 4 with a remainder of 160.
The next digit of our result is 4. 
Result so far: 81953.94615384
Subtract 1040 from 1200 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

After the division, we end up with 81953.94615384 and a remainder of 1.6e-07.