We look at the division of 25186 by 77 
The aim is to understand the frequency of 77 in 25186.

Moving on to step 1:
When dividing 2 by 77, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 77

Step 2:
When dividing 25 by 77, we get 0 with a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 25, we end up with 25.
Include the next digit (1) from the dividend after 25, then repeat: 251 / 77

Let's proceed to step 3:
77 goes into 251 3 times with a remainder of 20.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 231 away from 251, we end up with 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 77

On to step 4:
The number 77 fits into 208 2 times, leaving a remainder of 54.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
The remainder is 54 after subtracting 154 from 208.
Bring next digit (6) of the dividend behind the 54 and repeat the process: 546 / 77

Moving on to step 5:
546 divided by 77 is 7 with a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 327.0
If we take 539 away from 546, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 6:
When dividing 70 by 77, we get 0 with a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 327.0
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 7:
77 can be fit into 700 9 times, resulting in a remainder of 7.
Put 9 as the next digit of the answer. 
Result so far: 327.09
Subtract 693 from 700 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 8:
If we divide 70 by 77, we get 0 and a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 327.09
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 9:
77 goes into 700 9 times with a remainder of 7.
Record the quotient 9 as the next digit in the result. 
Result so far: 327.0909
Deduct 693 from 700 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 10:
The number 77 fits into 70 0 times, leaving a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 327.0909
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 11:
When dividing 700 by 77, we get 9 with a remainder of 7.
The next digit of our result is 9. 
Result so far: 327.090909
Subtracting 693 from 700 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 12:
If we divide 70 by 77, we get 0 and a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 327.090909
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 13:
700 divided by 77 is 9 with a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 327.09090909
Subtract 693 from 700 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 327.09090909, and the remainder is 7e-09.