We look at the division of 72540575 by 181 
The aim is to understand the frequency of 181 in 72540575.

Advancing to step 1:
The number 181 fits into 7 0 times, leaving a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 181

On to step 2:
When dividing 72 by 181, we get 0 with a remainder of 72.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 72 leaves us with 72.
Take the next digit (5) from the dividend and append it to 72, then repeat: 725 / 181

Advancing to step 3:
The number 181 fits into 725 4 times, leaving a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 724 from 725 leaves us with 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 181

Let's proceed to step 4:
181 can be fit into 14 0 times, resulting in a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 40.0
If we take 0 away from 14, we end up with 14.
Fetch the next digit (0) from the dividend, attach it to 14 and continue: 140 / 181

Advancing to step 5:
140 divided by 181 is 0 with a remainder of 140.
Put 0 as the next digit of the answer. 
Result so far: 400.0
The remainder is 140 after subtracting 0 from 140.
Include the next digit (5) from the dividend after 140, then repeat: 1405 / 181

Step 6:
If we divide 1405 by 181, we get 7 and a remainder of 138.
Use 7 as the next digit of our solution. 
Result so far: 4007.0
Deduct 1267 from 1405 and we're left with 138.
Take the next digit (7) from the dividend and append it to 138, then repeat: 1387 / 181

Advancing to step 7:
If we divide 1387 by 181, we get 7 and a remainder of 120.
The number 7 becomes the next digit in our result. 
Result so far: 40077.0
Subtract 1267 from 1387 to get 120.
Grab the next digit (5) from the dividend, add it to 120, then carry on: 1205 / 181

Step 8:
1205 divided by 181 is 6 with a remainder of 119.
Use 6 as the next digit of our solution. 
Result so far: 400776.0
If we take 1086 away from 1205, we end up with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Moving on to step 9:
181 goes into 1190 6 times with a remainder of 104.
The next digit of our result is 6. 
Result so far: 400776.6
The remainder is 104 after subtracting 1086 from 1190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Let's proceed to step 10:
1040 divided by 181 is 5 with a remainder of 135.
The next digit of our result is 5. 
Result so far: 400776.65
If we take 905 away from 1040, we end up with 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Advancing to step 11:
181 can be fit into 1350 7 times, resulting in a remainder of 83.
Use 7 as the next digit of our solution. 
Result so far: 400776.657
Deduct 1267 from 1350 and we're left with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Let's proceed to step 12:
When dividing 830 by 181, we get 4 with a remainder of 106.
The number 4 becomes the next digit in our result. 
Result so far: 400776.6574
If we subtract 724 from 830, we get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Moving on to step 13:
The number 181 fits into 1060 5 times, leaving a remainder of 155.
Write down 5 as next digit of the result. 
Result so far: 400776.65745
If we take 905 away from 1060, we end up with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Step 14:
1550 divided by 181 is 8 with a remainder of 102.
Record the quotient 8 as the next digit in the result. 
Result so far: 400776.657458
Deduct 1448 from 1550 and we're left with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Moving on to step 15:
1020 divided by 181 is 5 with a remainder of 115.
Use 5 as the next digit of our solution. 
Result so far: 400776.6574585
Deduct 905 from 1020 and we're left with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Step 16:
The number 181 fits into 1150 6 times, leaving a remainder of 64.
Write down 6 as next digit of the result. 
Result so far: 400776.65745856
If we subtract 1086 from 1150, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Our division results in 400776.65745856 with a remaining 6.4e-08.