77688215 ÷ 789 
The aim is to understand the frequency of 789 in 77688215.

Advancing to step 1:
When dividing 7 by 789, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 789

Step 2:
789 can be fit into 77 0 times, resulting in a remainder of 77.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 77 and we're left with 77.
Bring next digit (6) of the dividend behind the 77 and repeat the process: 776 / 789

Step 3:
789 can be fit into 776 0 times, resulting in a remainder of 776.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 776, we end up with 776.
Include the next digit (8) from the dividend after 776, then repeat: 7768 / 789

Let's proceed to step 4:
7768 divided by 789 is 9 with a remainder of 667.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we subtract 7101 from 7768, we get 667.
Bring next digit (8) of the dividend behind the 667 and repeat the process: 6678 / 789

On to step 5:
When dividing 6678 by 789, we get 8 with a remainder of 366.
Write down 8 as next digit of the result. 
Result so far: 98.0
Subtract 6312 from 6678 to get 366.
Include the next digit (2) from the dividend after 366, then repeat: 3662 / 789

Step 6:
789 can be fit into 3662 4 times, resulting in a remainder of 506.
Use 4 as the next digit of our solution. 
Result so far: 984.0
If we take 3156 away from 3662, we end up with 506.
Include the next digit (1) from the dividend after 506, then repeat: 5061 / 789

Advancing to step 7:
789 can be fit into 5061 6 times, resulting in a remainder of 327.
The next digit of our result is 6. 
Result so far: 9846.0
If we take 4734 away from 5061, we end up with 327.
Fetch the next digit (5) from the dividend, attach it to 327 and continue: 3275 / 789

Advancing to step 8:
When dividing 3275 by 789, we get 4 with a remainder of 119.
Write down 4 as next digit of the result. 
Result so far: 98464.0
Subtract 3156 from 3275 to get 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

On to step 9:
1190 divided by 789 is 1 with a remainder of 401.
The next digit of our result is 1. 
Result so far: 98464.1
Subtracting 789 from 1190 leaves us with 401.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Moving on to step 10:
4010 divided by 789 is 5 with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 98464.15
If we take 3945 away from 4010, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 11:
When dividing 650 by 789, we get 0 with a remainder of 650.
Record the quotient 0 as the next digit in the result. 
Result so far: 98464.15
Subtracting 0 from 650 leaves us with 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6500, and continue the process.

On to step 12:
6500 divided by 789 is 8 with a remainder of 188.
Use 8 as the next digit of our solution. 
Result so far: 98464.1508
If we take 6312 away from 6500, we end up with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Let's proceed to step 13:
1880 divided by 789 is 2 with a remainder of 302.
The next digit of our result is 2. 
Result so far: 98464.15082
Subtract 1578 from 1880 to get 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

On to step 14:
789 can be fit into 3020 3 times, resulting in a remainder of 653.
Write down 3 as next digit of the result. 
Result so far: 98464.150823
Deduct 2367 from 3020 and we're left with 653.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6530, and continue the process.

Going ahead to step 15:
6530 divided by 789 is 8 with a remainder of 218.
The next digit of our result is 8. 
Result so far: 98464.1508238
If we take 6312 away from 6530, we end up with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Advancing to step 16:
If we divide 2180 by 789, we get 2 and a remainder of 602.
The number 2 becomes the next digit in our result. 
Result so far: 98464.15082382
If we subtract 1578 from 2180, we get 602.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6020, and continue the process.

Our division results in 98464.15082382 with a remaining 6.02e-07.