We look at the division of 357390 by 77 
The aim is to understand the frequency of 77 in 357390.

On to step 1:
The number 77 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 77

On to step 2:
35 divided by 77 is 0 with a remainder of 35.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 35 to get 35.
Include the next digit (7) from the dividend after 35, then repeat: 357 / 77

Step 3:
The number 77 fits into 357 4 times, leaving a remainder of 49.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 308 from 357, we get 49.
Grab the next digit (3) from the dividend, add it to 49, then carry on: 493 / 77

Going ahead to step 4:
77 can be fit into 493 6 times, resulting in a remainder of 31.
Put 6 as the next digit of the answer. 
Result so far: 46.0
Subtract 462 from 493 to get 31.
Append the next digit (9) from the dividend to 31 and continue with: 319 / 77

Advancing to step 5:
77 goes into 319 4 times with a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 464.0
If we subtract 308 from 319, we get 11.
Grab the next digit (0) from the dividend, add it to 11, then carry on: 110 / 77

Going ahead to step 6:
If we divide 110 by 77, we get 1 and a remainder of 33.
The next digit of our result is 1. 
Result so far: 4641.0
If we take 77 away from 110, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 7:
If we divide 330 by 77, we get 4 and a remainder of 22.
Use 4 as the next digit of our solution. 
Result so far: 4641.4
If we subtract 308 from 330, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 8:
When dividing 220 by 77, we get 2 with a remainder of 66.
The number 2 becomes the next digit in our result. 
Result so far: 4641.42
Subtract 154 from 220 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 9:
77 can be fit into 660 8 times, resulting in a remainder of 44.
The number 8 becomes the next digit in our result. 
Result so far: 4641.428
If we subtract 616 from 660, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 10:
440 divided by 77 is 5 with a remainder of 55.
The next digit of our result is 5. 
Result so far: 4641.4285
Subtracting 385 from 440 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 11:
If we divide 550 by 77, we get 7 and a remainder of 11.
The next digit of our result is 7. 
Result so far: 4641.42857
If we subtract 539 from 550, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 12:
If we divide 110 by 77, we get 1 and a remainder of 33.
The number 1 becomes the next digit in our result. 
Result so far: 4641.428571
The remainder is 33 after subtracting 77 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 13:
The number 77 fits into 330 4 times, leaving a remainder of 22.
The next digit of our result is 4. 
Result so far: 4641.4285714
If we subtract 308 from 330, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 14:
77 can be fit into 220 2 times, resulting in a remainder of 66.
Use 2 as the next digit of our solution. 
Result so far: 4641.42857142
Subtracting 154 from 220 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Our division results in 4641.42857142 with a remaining 6.6e-08.