77793890 divided by 770 
The aim is to understand the frequency of 770 in 77793890.

Step 1:
770 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 770

Moving on to step 2:
If we divide 77 by 770, we get 0 and a remainder of 77.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 77 to get 77.
Grab the next digit (7) from the dividend, add it to 77, then carry on: 777 / 770

Let's proceed to step 3:
The number 770 fits into 777 1 times, leaving a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 7 after subtracting 770 from 777.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 770

Let's proceed to step 4:
When dividing 79 by 770, we get 0 with a remainder of 79.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Deduct 0 from 79 and we're left with 79.
Include the next digit (3) from the dividend after 79, then repeat: 793 / 770

On to step 5:
If we divide 793 by 770, we get 1 and a remainder of 23.
The number 1 becomes the next digit in our result. 
Result so far: 101.0
The remainder is 23 after subtracting 770 from 793.
Take the next digit (8) from the dividend and append it to 23, then repeat: 238 / 770

Advancing to step 6:
If we divide 238 by 770, we get 0 and a remainder of 238.
Record the quotient 0 as the next digit in the result. 
Result so far: 1010.0
Subtract 0 from 238 to get 238.
Grab the next digit (9) from the dividend, add it to 238, then carry on: 2389 / 770

On to step 7:
2389 divided by 770 is 3 with a remainder of 79.
Record the quotient 3 as the next digit in the result. 
Result so far: 10103.0
Subtract 2310 from 2389 to get 79.
Append the next digit (0) from the dividend to 79 and continue with: 790 / 770

Moving on to step 8:
790 divided by 770 is 1 with a remainder of 20.
The next digit of our result is 1. 
Result so far: 101031.0
Deduct 770 from 790 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
770 goes into 200 0 times with a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 101031.0
If we take 0 away from 200, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 10:
If we divide 2000 by 770, we get 2 and a remainder of 460.
Use 2 as the next digit of our solution. 
Result so far: 101031.02
The remainder is 460 after subtracting 1540 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Advancing to step 11:
If we divide 4600 by 770, we get 5 and a remainder of 750.
Put 5 as the next digit of the answer. 
Result so far: 101031.025
Subtract 3850 from 4600 to get 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Advancing to step 12:
When dividing 7500 by 770, we get 9 with a remainder of 570.
Put 9 as the next digit of the answer. 
Result so far: 101031.0259
Subtract 6930 from 7500 to get 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5700, and continue the process.

Advancing to step 13:
5700 divided by 770 is 7 with a remainder of 310.
The next digit of our result is 7. 
Result so far: 101031.02597
If we subtract 5390 from 5700, we get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Let's proceed to step 14:
If we divide 3100 by 770, we get 4 and a remainder of 20.
The next digit of our result is 4. 
Result so far: 101031.025974
Deduct 3080 from 3100 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 15:
770 goes into 200 0 times with a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 101031.025974
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 16:
770 can be fit into 2000 2 times, resulting in a remainder of 460.
Record the quotient 2 as the next digit in the result. 
Result so far: 101031.02597402
If we subtract 1540 from 2000, we get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

The final outcome is 101031.02597402, with a leftover of 4.6e-07.