We look at the division of 81100086 by 549 
The aim is to understand the frequency of 549 in 81100086.

Moving on to step 1:
8 divided by 549 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 549

Going ahead to step 2:
81 divided by 549 is 0 with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Include the next digit (1) from the dividend after 81, then repeat: 811 / 549

Moving on to step 3:
If we divide 811 by 549, we get 1 and a remainder of 262.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 262 after subtracting 549 from 811.
Bring next digit (0) of the dividend behind the 262 and repeat the process: 2620 / 549

On to step 4:
549 can be fit into 2620 4 times, resulting in a remainder of 424.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtracting 2196 from 2620 leaves us with 424.
Include the next digit (0) from the dividend after 424, then repeat: 4240 / 549

Let's proceed to step 5:
4240 divided by 549 is 7 with a remainder of 397.
Write down 7 as next digit of the result. 
Result so far: 147.0
The remainder is 397 after subtracting 3843 from 4240.
Include the next digit (0) from the dividend after 397, then repeat: 3970 / 549

Moving on to step 6:
The number 549 fits into 3970 7 times, leaving a remainder of 127.
Write down 7 as next digit of the result. 
Result so far: 1477.0
If we subtract 3843 from 3970, we get 127.
Take the next digit (8) from the dividend and append it to 127, then repeat: 1278 / 549

On to step 7:
The number 549 fits into 1278 2 times, leaving a remainder of 180.
The number 2 becomes the next digit in our result. 
Result so far: 14772.0
Deduct 1098 from 1278 and we're left with 180.
Take the next digit (6) from the dividend and append it to 180, then repeat: 1806 / 549

Step 8:
1806 divided by 549 is 3 with a remainder of 159.
The next digit of our result is 3. 
Result so far: 147723.0
Subtracting 1647 from 1806 leaves us with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Going ahead to step 9:
1590 divided by 549 is 2 with a remainder of 492.
Record the quotient 2 as the next digit in the result. 
Result so far: 147723.2
The remainder is 492 after subtracting 1098 from 1590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4920, and continue the process.

On to step 10:
If we divide 4920 by 549, we get 8 and a remainder of 528.
The number 8 becomes the next digit in our result. 
Result so far: 147723.28
Subtract 4392 from 4920 to get 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Advancing to step 11:
When dividing 5280 by 549, we get 9 with a remainder of 339.
Record the quotient 9 as the next digit in the result. 
Result so far: 147723.289
The remainder is 339 after subtracting 4941 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3390, and continue the process.

On to step 12:
When dividing 3390 by 549, we get 6 with a remainder of 96.
Write down 6 as next digit of the result. 
Result so far: 147723.2896
The remainder is 96 after subtracting 3294 from 3390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 13:
549 can be fit into 960 1 times, resulting in a remainder of 411.
The next digit of our result is 1. 
Result so far: 147723.28961
Subtracting 549 from 960 leaves us with 411.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4110, and continue the process.

Advancing to step 14:
4110 divided by 549 is 7 with a remainder of 267.
Record the quotient 7 as the next digit in the result. 
Result so far: 147723.289617
Deduct 3843 from 4110 and we're left with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

On to step 15:
If we divide 2670 by 549, we get 4 and a remainder of 474.
The number 4 becomes the next digit in our result. 
Result so far: 147723.2896174
If we subtract 2196 from 2670, we get 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

Step 16:
The number 549 fits into 4740 8 times, leaving a remainder of 348.
The next digit of our result is 8. 
Result so far: 147723.28961748
Subtract 4392 from 4740 to get 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

After the division, we end up with 147723.28961748 and a remainder of 3.48e-07.