20526850 divided by 660 
The aim is to understand the frequency of 660 in 20526850.

On to step 1:
When dividing 2 by 660, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 660

On to step 2:
If we divide 20 by 660, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Grab the next digit (5) from the dividend, add it to 20, then carry on: 205 / 660

Going ahead to step 3:
660 can be fit into 205 0 times, resulting in a remainder of 205.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 205, we end up with 205.
Grab the next digit (2) from the dividend, add it to 205, then carry on: 2052 / 660

Let's proceed to step 4:
If we divide 2052 by 660, we get 3 and a remainder of 72.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 1980 from 2052 to get 72.
Bring next digit (6) of the dividend behind the 72 and repeat the process: 726 / 660

Moving on to step 5:
If we divide 726 by 660, we get 1 and a remainder of 66.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
If we subtract 660 from 726, we get 66.
Include the next digit (8) from the dividend after 66, then repeat: 668 / 660

Moving on to step 6:
If we divide 668 by 660, we get 1 and a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 311.0
Deduct 660 from 668 and we're left with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 660

On to step 7:
If we divide 85 by 660, we get 0 and a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 3110.0
The remainder is 85 after subtracting 0 from 85.
Include the next digit (0) from the dividend after 85, then repeat: 850 / 660

On to step 8:
660 goes into 850 1 times with a remainder of 190.
The next digit of our result is 1. 
Result so far: 31101.0
Subtract 660 from 850 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Let's proceed to step 9:
660 goes into 1900 2 times with a remainder of 580.
The next digit of our result is 2. 
Result so far: 31101.2
If we subtract 1320 from 1900, we get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

On to step 10:
660 goes into 5800 8 times with a remainder of 520.
The number 8 becomes the next digit in our result. 
Result so far: 31101.28
Subtract 5280 from 5800 to get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Moving on to step 11:
If we divide 5200 by 660, we get 7 and a remainder of 580.
Use 7 as the next digit of our solution. 
Result so far: 31101.287
The remainder is 580 after subtracting 4620 from 5200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Going ahead to step 12:
When dividing 5800 by 660, we get 8 with a remainder of 520.
Use 8 as the next digit of our solution. 
Result so far: 31101.2878
Deduct 5280 from 5800 and we're left with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Advancing to step 13:
5200 divided by 660 is 7 with a remainder of 580.
The next digit of our result is 7. 
Result so far: 31101.28787
The remainder is 580 after subtracting 4620 from 5200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Let's proceed to step 14:
The number 660 fits into 5800 8 times, leaving a remainder of 520.
Write down 8 as next digit of the result. 
Result so far: 31101.287878
Subtracting 5280 from 5800 leaves us with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

On to step 15:
If we divide 5200 by 660, we get 7 and a remainder of 580.
Use 7 as the next digit of our solution. 
Result so far: 31101.2878787
Subtracting 4620 from 5200 leaves us with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Advancing to step 16:
If we divide 5800 by 660, we get 8 and a remainder of 520.
Write down 8 as next digit of the result. 
Result so far: 31101.28787878
The remainder is 520 after subtracting 5280 from 5800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

The final outcome is 31101.28787878, with a leftover of 5.2e-07.