308400 ÷ 77 
The aim is to understand the frequency of 77 in 308400.

Moving on to step 1:
When dividing 3 by 77, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 77

On to step 2:
30 divided by 77 is 0 with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Append the next digit (8) from the dividend to 30 and continue with: 308 / 77

Moving on to step 3:
77 goes into 308 4 times with a remainder of 0.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 308 from 308 leaves us with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 77

Let's proceed to step 4:
The number 77 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 77

Going ahead to step 5:
When dividing 40 by 77, we get 0 with a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 400.0
If we subtract 0 from 40, we get 40.
Take the next digit (0) from the dividend and append it to 40, then repeat: 400 / 77

On to step 6:
If we divide 400 by 77, we get 5 and a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 4005.0
Deduct 385 from 400 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 7:
If we divide 150 by 77, we get 1 and a remainder of 73.
Use 1 as the next digit of our solution. 
Result so far: 4005.1
If we subtract 77 from 150, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 8:
The number 77 fits into 730 9 times, leaving a remainder of 37.
Use 9 as the next digit of our solution. 
Result so far: 4005.19
If we subtract 693 from 730, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 9:
The number 77 fits into 370 4 times, leaving a remainder of 62.
Record the quotient 4 as the next digit in the result. 
Result so far: 4005.194
If we take 308 away from 370, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 10:
The number 77 fits into 620 8 times, leaving a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 4005.1948
Subtracting 616 from 620 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
If we divide 40 by 77, we get 0 and a remainder of 40.
The next digit of our result is 0. 
Result so far: 4005.1948
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
The number 77 fits into 400 5 times, leaving a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 4005.194805
If we subtract 385 from 400, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 13:
77 can be fit into 150 1 times, resulting in a remainder of 73.
The number 1 becomes the next digit in our result. 
Result so far: 4005.1948051
Subtracting 77 from 150 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 14:
77 can be fit into 730 9 times, resulting in a remainder of 37.
The number 9 becomes the next digit in our result. 
Result so far: 4005.19480519
If we take 693 away from 730, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

The final result is 4005.19480519 with a remainder of 3.7e-08.