We're dividing 43552981 by 519 
The aim is to understand the frequency of 519 in 43552981.

On to step 1:
The number 519 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 519

Moving on to step 2:
The number 519 fits into 43 0 times, leaving a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 43, we end up with 43.
Append the next digit (5) from the dividend to 43 and continue with: 435 / 519

Moving on to step 3:
The number 519 fits into 435 0 times, leaving a remainder of 435.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 435 and we're left with 435.
Take the next digit (5) from the dividend and append it to 435, then repeat: 4355 / 519

Moving on to step 4:
When dividing 4355 by 519, we get 8 with a remainder of 203.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 4152 from 4355 to get 203.
Fetch the next digit (2) from the dividend, attach it to 203 and continue: 2032 / 519

Moving on to step 5:
2032 divided by 519 is 3 with a remainder of 475.
Write down 3 as next digit of the result. 
Result so far: 83.0
If we subtract 1557 from 2032, we get 475.
Grab the next digit (9) from the dividend, add it to 475, then carry on: 4759 / 519

Advancing to step 6:
If we divide 4759 by 519, we get 9 and a remainder of 88.
Write down 9 as next digit of the result. 
Result so far: 839.0
Subtracting 4671 from 4759 leaves us with 88.
Bring next digit (8) of the dividend behind the 88 and repeat the process: 888 / 519

Step 7:
If we divide 888 by 519, we get 1 and a remainder of 369.
Use 1 as the next digit of our solution. 
Result so far: 8391.0
Subtract 519 from 888 to get 369.
Grab the next digit (1) from the dividend, add it to 369, then carry on: 3691 / 519

Going ahead to step 8:
3691 divided by 519 is 7 with a remainder of 58.
Put 7 as the next digit of the answer. 
Result so far: 83917.0
Subtract 3633 from 3691 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 9:
580 divided by 519 is 1 with a remainder of 61.
Put 1 as the next digit of the answer. 
Result so far: 83917.1
Deduct 519 from 580 and we're left 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.

Step 10:
If we divide 610 by 519, we get 1 and a remainder of 91.
The next digit of our result is 1. 
Result so far: 83917.11
Deduct 519 from 610 and we're left with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Our division results in 83917.11 with a remaining 0.091.