7648977 ÷ 309 
The aim is to understand the frequency of 309 in 7648977.

Advancing to step 1:
309 goes into 7 0 times with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (6) from the dividend after 7, then repeat: 76 / 309

Advancing to step 2:
76 divided by 309 is 0 with a remainder of 76.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 76 leaves us with 76.
Append the next digit (4) from the dividend to 76 and continue with: 764 / 309

Moving on to step 3:
309 can be fit into 764 2 times, resulting in a remainder of 146.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 146 after subtracting 618 from 764.
Append the next digit (8) from the dividend to 146 and continue with: 1468 / 309

Going ahead to step 4:
The number 309 fits into 1468 4 times, leaving a remainder of 232.
Use 4 as the next digit of our solution. 
Result so far: 24.0
Deduct 1236 from 1468 and we're left with 232.
Bring next digit (9) of the dividend behind the 232 and repeat the process: 2329 / 309

Moving on to step 5:
When dividing 2329 by 309, we get 7 with a remainder of 166.
Use 7 as the next digit of our solution. 
Result so far: 247.0
If we take 2163 away from 2329, we end up with 166.
Append the next digit (7) from the dividend to 166 and continue with: 1667 / 309

Going ahead to step 6:
The number 309 fits into 1667 5 times, leaving a remainder of 122.
The next digit of our result is 5. 
Result so far: 2475.0
Subtracting 1545 from 1667 leaves us with 122.
Take the next digit (7) from the dividend and append it to 122, then repeat: 1227 / 309

Advancing to step 7:
When dividing 1227 by 309, we get 3 with a remainder of 300.
Record the quotient 3 as the next digit in the result. 
Result so far: 24753.0
Subtracting 927 from 1227 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Let's proceed to step 8:
The number 309 fits into 3000 9 times, leaving a remainder of 219.
Write down 9 as next digit of the result. 
Result so far: 24753.9
Subtract 2781 from 3000 to get 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Step 9:
309 goes into 2190 7 times with a remainder of 27.
Use 7 as the next digit of our solution. 
Result so far: 24753.97
Subtract 2163 from 2190 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 10:
If we divide 270 by 309, we get 0 and a remainder of 270.
The next digit of our result is 0. 
Result so far: 24753.97
If we subtract 0 from 270, we get 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Going ahead to step 11:
If we divide 2700 by 309, we get 8 and a remainder of 228.
The next digit of our result is 8. 
Result so far: 24753.9708
If we subtract 2472 from 2700, we get 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Going ahead to step 12:
2280 divided by 309 is 7 with a remainder of 117.
Put 7 as the next digit of the answer. 
Result so far: 24753.97087
If we take 2163 away from 2280, we end up with 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Let's proceed to step 13:
1170 divided by 309 is 3 with a remainder of 243.
The number 3 becomes the next digit in our result. 
Result so far: 24753.970873
Deduct 927 from 1170 and we're left with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Going ahead to step 14:
309 can be fit into 2430 7 times, resulting in a remainder of 267.
Record the quotient 7 as the next digit in the result. 
Result so far: 24753.9708737
Deduct 2163 from 2430 and we're left with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Going ahead to step 15:
The number 309 fits into 2670 8 times, leaving a remainder of 198.
The next digit of our result is 8. 
Result so far: 24753.97087378
If we take 2472 away from 2670, we end up with 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

Our division results in 24753.97087378 with a remaining 1.98e-07.