81524070 ÷ 668 
The aim is to understand the frequency of 668 in 81524070.

Advancing to step 1:
668 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 668

On to step 2:
668 goes into 81 0 times with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Fetch the next digit (5) from the dividend, attach it to 81 and continue: 815 / 668

Moving on to step 3:
If we divide 815 by 668, we get 1 and a remainder of 147.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 668 away from 815, we end up with 147.
Append the next digit (2) from the dividend to 147 and continue with: 1472 / 668

Moving on to step 4:
When dividing 1472 by 668, we get 2 with a remainder of 136.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 1336 from 1472 and we're left with 136.
Bring next digit (4) of the dividend behind the 136 and repeat the process: 1364 / 668

Let's proceed to step 5:
When dividing 1364 by 668, we get 2 with a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 122.0
If we take 1336 away from 1364, we end up with 28.
Take the next digit (0) from the dividend and append it to 28, then repeat: 280 / 668

Going ahead to step 6:
280 divided by 668 is 0 with a remainder of 280.
The next digit of our result is 0. 
Result so far: 1220.0
If we subtract 0 from 280, we get 280.
Append the next digit (7) from the dividend to 280 and continue with: 2807 / 668

On to step 7:
If we divide 2807 by 668, we get 4 and a remainder of 135.
Write down 4 as next digit of the result. 
Result so far: 12204.0
Deduct 2672 from 2807 and we're left with 135.
Grab the next digit (0) from the dividend, add it to 135, then carry on: 1350 / 668

Going ahead to step 8:
668 goes into 1350 2 times with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 122042.0
Deduct 1336 from 1350 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 9:
140 divided by 668 is 0 with a remainder of 140.
The next digit of our result is 0. 
Result so far: 122042.0
If we subtract 0 from 140, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 10:
If we divide 1400 by 668, we get 2 and a remainder of 64.
Record the quotient 2 as the next digit in the result. 
Result so far: 122042.02
If we subtract 1336 from 1400, 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.

Going ahead to step 11:
668 can be fit into 640 0 times, resulting in a remainder of 640.
Write down 0 as next digit of the result. 
Result so far: 122042.02
Subtract 0 from 640 to get 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Advancing to step 12:
When dividing 6400 by 668, we get 9 with a remainder of 388.
Write down 9 as next digit of the result. 
Result so far: 122042.0209
Deduct 6012 from 6400 and we're left with 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Going ahead to step 13:
668 can be fit into 3880 5 times, resulting in a remainder of 540.
Write down 5 as next digit of the result. 
Result so far: 122042.02095
Subtract 3340 from 3880 to get 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Moving on to step 14:
5400 divided by 668 is 8 with a remainder of 56.
Put 8 as the next digit of the answer. 
Result so far: 122042.020958
Subtracting 5344 from 5400 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 15:
668 can be fit into 560 0 times, resulting in a remainder of 560.
The number 0 becomes the next digit in our result. 
Result so far: 122042.020958
Subtracting 0 from 560 leaves us with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

On to step 16:
668 can be fit into 5600 8 times, resulting in a remainder of 256.
The number 8 becomes the next digit in our result. 
Result so far: 122042.02095808
If we subtract 5344 from 5600, we get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

The final outcome is 122042.02095808, with a leftover of 2.56e-07.