81577808 ÷ 671 
The aim is to understand the frequency of 671 in 81577808.

Step 1:
If we divide 8 by 671, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 671

Let's proceed to step 2:
671 can be fit into 81 0 times, resulting in a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Fetch the next digit (5) from the dividend, attach it to 81 and continue: 815 / 671

Going ahead to step 3:
671 goes into 815 1 times with a remainder of 144.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 671 away from 815, we end up with 144.
Fetch the next digit (7) from the dividend, attach it to 144 and continue: 1447 / 671

Step 4:
The number 671 fits into 1447 2 times, leaving a remainder of 105.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
The remainder is 105 after subtracting 1342 from 1447.
Include the next digit (7) from the dividend after 105, then repeat: 1057 / 671

On to step 5:
1057 divided by 671 is 1 with a remainder of 386.
Use 1 as the next digit of our solution. 
Result so far: 121.0
Deduct 671 from 1057 and we're left with 386.
Append the next digit (8) from the dividend to 386 and continue with: 3868 / 671

Advancing to step 6:
671 goes into 3868 5 times with a remainder of 513.
Use 5 as the next digit of our solution. 
Result so far: 1215.0
Subtract 3355 from 3868 to get 513.
Include the next digit (0) from the dividend after 513, then repeat: 5130 / 671

Moving on to step 7:
671 can be fit into 5130 7 times, resulting in a remainder of 433.
Use 7 as the next digit of our solution. 
Result so far: 12157.0
Subtracting 4697 from 5130 leaves us with 433.
Append the next digit (8) from the dividend to 433 and continue with: 4338 / 671

Step 8:
When dividing 4338 by 671, we get 6 with a remainder of 312.
Record the quotient 6 as the next digit in the result. 
Result so far: 121576.0
The remainder is 312 after subtracting 4026 from 4338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Step 9:
3120 divided by 671 is 4 with a remainder of 436.
The next digit of our result is 4. 
Result so far: 121576.4
If we take 2684 away from 3120, we end up with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Going ahead to step 10:
671 goes into 4360 6 times with a remainder of 334.
Record the quotient 6 as the next digit in the result. 
Result so far: 121576.46
The remainder is 334 after subtracting 4026 from 4360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Step 11:
If we divide 3340 by 671, we get 4 and a remainder of 656.
The next digit of our result is 4. 
Result so far: 121576.464
Subtracting 2684 from 3340 leaves us with 656.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6560, and continue the process.

Let's proceed to step 12:
671 can be fit into 6560 9 times, resulting in a remainder of 521.
Record the quotient 9 as the next digit in the result. 
Result so far: 121576.4649
Subtract 6039 from 6560 to get 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5210, and continue the process.

Moving on to step 13:
The number 671 fits into 5210 7 times, leaving a remainder of 513.
The number 7 becomes the next digit in our result. 
Result so far: 121576.46497
Deduct 4697 from 5210 and we're left with 513.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5130, and continue the process.

Advancing to step 14:
671 goes into 5130 7 times with a remainder of 433.
The number 7 becomes the next digit in our result. 
Result so far: 121576.464977
If we subtract 4697 from 5130, we get 433.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4330, and continue the process.

The final result is 121576.464977 with a remainder of 4.33e-05.