We look at the division of 873534 by 77 
The aim is to understand the frequency of 77 in 873534.

Going ahead to step 1:
77 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 77

Let's proceed to step 2:
If we divide 87 by 77, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 77 from 87 to get 10.
Fetch the next digit (3) from the dividend, attach it to 10 and continue: 103 / 77

Step 3:
If we divide 103 by 77, we get 1 and a remainder of 26.
The next digit of our result is 1. 
Result so far: 11.0
Subtracting 77 from 103 leaves us with 26.
Append the next digit (5) from the dividend to 26 and continue with: 265 / 77

On to step 4:
When dividing 265 by 77, we get 3 with a remainder of 34.
Write down 3 as next digit of the result. 
Result so far: 113.0
If we take 231 away from 265, we end up with 34.
Bring next digit (3) of the dividend behind the 34 and repeat the process: 343 / 77

On to step 5:
77 goes into 343 4 times with a remainder of 35.
The next digit of our result is 4. 
Result so far: 1134.0
Deduct 308 from 343 and we're left with 35.
Take the next digit (4) from the dividend and append it to 35, then repeat: 354 / 77

Going ahead to step 6:
When dividing 354 by 77, we get 4 with a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 11344.0
Deduct 308 from 354 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 7:
460 divided by 77 is 5 with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 11344.5
If we take 385 away from 460, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 8:
If we divide 750 by 77, we get 9 and a remainder of 57.
Put 9 as the next digit of the answer. 
Result so far: 11344.59
If we subtract 693 from 750, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

On to step 9:
The number 77 fits into 570 7 times, leaving a remainder of 31.
The next digit of our result is 7. 
Result so far: 11344.597
Deduct 539 from 570 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 10:
If we divide 310 by 77, we get 4 and a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 11344.5974
If we take 308 away from 310, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
If we divide 20 by 77, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 11344.5974
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 12:
77 goes into 200 2 times with a remainder of 46.
Write down 2 as next digit of the result. 
Result so far: 11344.597402
The remainder is 46 after subtracting 154 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 13:
The number 77 fits into 460 5 times, leaving a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 11344.5974025
Deduct 385 from 460 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 14:
77 can be fit into 750 9 times, resulting in a remainder of 57.
Write down 9 as next digit of the result. 
Result so far: 11344.59740259
If we take 693 away from 750, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

The final result is 11344.59740259 with a remainder of 5.7e-08.