We're dividing 352512 by 77 
The aim is to understand the frequency of 77 in 352512.

On to step 1:
77 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us 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.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 35 after subtracting 0 from 35.
Include the next digit (2) from the dividend after 35, then repeat: 352 / 77

Step 3:
77 goes into 352 4 times with a remainder of 44.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 308 away from 352, we end up with 44.
Take the next digit (5) from the dividend and append it to 44, then repeat: 445 / 77

Moving on to step 4:
445 divided by 77 is 5 with a remainder of 60.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Subtract 385 from 445 to get 60.
Append the next digit (1) from the dividend to 60 and continue with: 601 / 77

Going ahead to step 5:
When dividing 601 by 77, we get 7 with a remainder of 62.
The next digit of our result is 7. 
Result so far: 457.0
Deduct 539 from 601 and we're left with 62.
Fetch the next digit (2) from the dividend, attach it to 62 and continue: 622 / 77

Moving on to step 6:
The number 77 fits into 622 8 times, leaving a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 4578.0
Deduct 616 from 622 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
60 divided by 77 is 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 4578.0
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 8:
When dividing 600 by 77, we get 7 with a remainder of 61.
The number 7 becomes the next digit in our result. 
Result so far: 4578.07
If we take 539 away from 600, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 9:
610 divided by 77 is 7 with a remainder of 71.
The next digit of our result is 7. 
Result so far: 4578.077
Deduct 539 from 610 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

The final outcome is 4578.077, with a leftover of 0.0071.