Let's divide 309988 by 77
The aim is to understand the frequency of 77 in 309988.

Let's proceed to step 1:
When dividing 3 by 77, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 77

On to step 2:
77 goes into 30 0 times with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Grab the next digit (9) from the dividend, add it to 30, then carry on: 309 / 77

Advancing to step 3:
309 divided by 77 is 4 with a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 308 away from 309, we end up with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 77

On to step 4:
19 divided by 77 is 0 with a remainder of 19.
The next digit of our result is 0. 
Result so far: 40.0
The remainder is 19 after subtracting 0 from 19.
Grab the next digit (8) from the dividend, add it to 19, then carry on: 198 / 77

Moving on to step 5:
The number 77 fits into 198 2 times, leaving a remainder of 44.
The number 2 becomes the next digit in our result. 
Result so far: 402.0
The remainder is 44 after subtracting 154 from 198.
Append the next digit (8) from the dividend to 44 and continue with: 448 / 77

On to step 6:
If we divide 448 by 77, we get 5 and a remainder of 63.
Put 5 as the next digit of the answer. 
Result so far: 4025.0
Subtracting 385 from 448 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 7:
When dividing 630 by 77, we get 8 with a remainder of 14.
The number 8 becomes the next digit in our result. 
Result so far: 4025.8
Subtract 616 from 630 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 8:
When dividing 140 by 77, we get 1 with a remainder of 63.
Record the quotient 1 as the next digit in the result. 
Result so far: 4025.81
Deduct 77 from 140 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 9:
77 goes into 630 8 times with a remainder of 14.
The number 8 becomes the next digit in our result. 
Result so far: 4025.818
The remainder is 14 after subtracting 616 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 10:
The number 77 fits into 140 1 times, leaving a remainder of 63.
Write down 1 as next digit of the result. 
Result so far: 4025.8181
Subtracting 77 from 140 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 11:
77 can be fit into 630 8 times, resulting in a remainder of 14.
Record the quotient 8 as the next digit in the result. 
Result so far: 4025.81818
Deduct 616 from 630 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 12:
When dividing 140 by 77, we get 1 with a remainder of 63.
Record the quotient 1 as the next digit in the result. 
Result so far: 4025.818181
Subtracting 77 from 140 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 13:
77 goes into 630 8 times with a remainder of 14.
Put 8 as the next digit of the answer. 
Result so far: 4025.8181818
If we subtract 616 from 630, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 14:
77 goes into 140 1 times with a remainder of 63.
The number 1 becomes the next digit in our result. 
Result so far: 4025.81818181
Subtract 77 from 140 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

In conclusion, the division gives 4025.81818181 with a balance of 6.3e-08.