54389515 divided by 43 
The aim is to understand the frequency of 43 in 54389515.

On to step 1:
When dividing 5 by 43, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 43

Going ahead to step 2:
If we divide 54 by 43, we get 1 and a remainder of 11.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 43 from 54, we get 11.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 43

Moving on to step 3:
The number 43 fits into 113 2 times, leaving a remainder of 27.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we take 86 away from 113, we end up with 27.
Take the next digit (8) from the dividend and append it to 27, then repeat: 278 / 43

On to step 4:
43 goes into 278 6 times with a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 126.0
If we subtract 258 from 278, we get 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 43

On to step 5:
If we divide 209 by 43, we get 4 and a remainder of 37.
The number 4 becomes the next digit in our result. 
Result so far: 1264.0
The remainder is 37 after subtracting 172 from 209.
Include the next digit (5) from the dividend after 37, then repeat: 375 / 43

Moving on to step 6:
43 goes into 375 8 times with a remainder of 31.
Record the quotient 8 as the next digit in the result. 
Result so far: 12648.0
The remainder is 31 after subtracting 344 from 375.
Append the next digit (1) from the dividend to 31 and continue with: 311 / 43

Moving on to step 7:
When dividing 311 by 43, we get 7 with a remainder of 10.
Use 7 as the next digit of our solution. 
Result so far: 126487.0
The remainder is 10 after subtracting 301 from 311.
Bring next digit (5) of the dividend behind the 10 and repeat the process: 105 / 43

On to step 8:
43 goes into 105 2 times with a remainder of 19.
Record the quotient 2 as the next digit in the result. 
Result so far: 1264872.0
Subtracting 86 from 105 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 9:
43 can be fit into 190 4 times, resulting in a remainder of 18.
Record the quotient 4 as the next digit in the result. 
Result so far: 1264872.4
The remainder is 18 after subtracting 172 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 10:
180 divided by 43 is 4 with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 1264872.44
If we subtract 172 from 180, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 1264872.44, with a leftover of 0.008.