51697788 divided by 309 
The aim is to understand the frequency of 309 in 51697788.

Going ahead to step 1:
309 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 309

On to step 2:
309 goes into 51 0 times with a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Bring next digit (6) of the dividend behind the 51 and repeat the process: 516 / 309

Step 3:
309 can be fit into 516 1 times, resulting in a remainder of 207.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 309 from 516, we get 207.
Take the next digit (9) from the dividend and append it to 207, then repeat: 2079 / 309

Step 4:
309 can be fit into 2079 6 times, resulting in a remainder of 225.
The next digit of our result is 6. 
Result so far: 16.0
If we take 1854 away from 2079, we end up with 225.
Include the next digit (7) from the dividend after 225, then repeat: 2257 / 309

Let's proceed to step 5:
309 goes into 2257 7 times with a remainder of 94.
Record the quotient 7 as the next digit in the result. 
Result so far: 167.0
Subtract 2163 from 2257 to get 94.
Append the next digit (7) from the dividend to 94 and continue with: 947 / 309

On to step 6:
309 can be fit into 947 3 times, resulting in a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 1673.0
The remainder is 20 after subtracting 927 from 947.
Take the next digit (8) from the dividend and append it to 20, then repeat: 208 / 309

Step 7:
The number 309 fits into 208 0 times, leaving a remainder of 208.
Write down 0 as next digit of the result. 
Result so far: 16730.0
The remainder is 208 after subtracting 0 from 208.
Append the next digit (8) from the dividend to 208 and continue with: 2088 / 309

Let's proceed to step 8:
If we divide 2088 by 309, we get 6 and a remainder of 234.
Use 6 as the next digit of our solution. 
Result so far: 167306.0
If we take 1854 away from 2088, we end up with 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

Let's proceed to step 9:
When dividing 2340 by 309, we get 7 with a remainder of 177.
Put 7 as the next digit of the answer. 
Result so far: 167306.7
Deduct 2163 from 2340 and we're left with 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

Moving on to step 10:
309 can be fit into 1770 5 times, resulting in a remainder of 225.
The number 5 becomes the next digit in our result. 
Result so far: 167306.75
Deduct 1545 from 1770 and we're left with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Let's proceed to step 11:
If we divide 2250 by 309, we get 7 and a remainder of 87.
The next digit of our result is 7. 
Result so far: 167306.757
Deduct 2163 from 2250 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

On to step 12:
870 divided by 309 is 2 with a remainder of 252.
Use 2 as the next digit of our solution. 
Result so far: 167306.7572
If we subtract 618 from 870, we get 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

On to step 13:
The number 309 fits into 2520 8 times, leaving a remainder of 48.
The number 8 becomes the next digit in our result. 
Result so far: 167306.75728
Subtracting 2472 from 2520 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 14:
If we divide 480 by 309, we get 1 and a remainder of 171.
Write down 1 as next digit of the result. 
Result so far: 167306.757281
Subtracting 309 from 480 leaves us with 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Step 15:
If we divide 1710 by 309, we get 5 and a remainder of 165.
Record the quotient 5 as the next digit in the result. 
Result so far: 167306.7572815
If we take 1545 away from 1710, we end up with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Moving on to step 16:
The number 309 fits into 1650 5 times, leaving a remainder of 105.
Record the quotient 5 as the next digit in the result. 
Result so far: 167306.75728155
If we subtract 1545 from 1650, we get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

The final outcome is 167306.75728155, with a leftover of 1.05e-07.