Let's divide 77243980 by 519
The aim is to understand the frequency of 519 in 77243980.

On to step 1:
The number 519 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 519

Going ahead to step 2:
519 goes into 77 0 times with a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 77, we get 77.
Grab the next digit (2) from the dividend, add it to 77, then carry on: 772 / 519

Going ahead to step 3:
519 goes into 772 1 times with a remainder of 253.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 519 from 772 leaves us with 253.
Append the next digit (4) from the dividend to 253 and continue with: 2534 / 519

Moving on to step 4:
If we divide 2534 by 519, we get 4 and a remainder of 458.
Write down 4 as next digit of the result. 
Result so far: 14.0
Subtracting 2076 from 2534 leaves us with 458.
Fetch the next digit (3) from the dividend, attach it to 458 and continue: 4583 / 519

Step 5:
The number 519 fits into 4583 8 times, leaving a remainder of 431.
Record the quotient 8 as the next digit in the result. 
Result so far: 148.0
If we subtract 4152 from 4583, we get 431.
Fetch the next digit (9) from the dividend, attach it to 431 and continue: 4319 / 519

On to step 6:
The number 519 fits into 4319 8 times, leaving a remainder of 167.
Use 8 as the next digit of our solution. 
Result so far: 1488.0
Subtracting 4152 from 4319 leaves us with 167.
Bring next digit (8) of the dividend behind the 167 and repeat the process: 1678 / 519

Step 7:
If we divide 1678 by 519, we get 3 and a remainder of 121.
The next digit of our result is 3. 
Result so far: 14883.0
The remainder is 121 after subtracting 1557 from 1678.
Append the next digit (0) from the dividend to 121 and continue with: 1210 / 519

Let's proceed to step 8:
519 goes into 1210 2 times with a remainder of 172.
Use 2 as the next digit of our solution. 
Result so far: 148832.0
Deduct 1038 from 1210 and we're left with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Going ahead to step 9:
1720 divided by 519 is 3 with a remainder of 163.
Use 3 as the next digit of our solution. 
Result so far: 148832.3
If we take 1557 away from 1720, we end up with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Step 10:
The number 519 fits into 1630 3 times, leaving a remainder of 73.
Put 3 as the next digit of the answer. 
Result so far: 148832.33
Deduct 1557 from 1630 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

The quotient of the division is 148832.33, and the remainder is 0.073.