We divide 21975637 by 660
The aim is to understand the frequency of 660 in 21975637.

Moving on to step 1:
When dividing 2 by 660, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 660

Going ahead to step 2:
21 divided by 660 is 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Take the next digit (9) from the dividend and append it to 21, then repeat: 219 / 660

Going ahead to step 3:
660 can be fit into 219 0 times, resulting in a remainder of 219.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 219 and we're left with 219.
Grab the next digit (7) from the dividend, add it to 219, then carry on: 2197 / 660

Step 4:
When dividing 2197 by 660, we get 3 with a remainder of 217.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 1980 from 2197 leaves us with 217.
Bring next digit (5) of the dividend behind the 217 and repeat the process: 2175 / 660

Advancing to step 5:
The number 660 fits into 2175 3 times, leaving a remainder of 195.
Use 3 as the next digit of our solution. 
Result so far: 33.0
The remainder is 195 after subtracting 1980 from 2175.
Append the next digit (6) from the dividend to 195 and continue with: 1956 / 660

Advancing to step 6:
The number 660 fits into 1956 2 times, leaving a remainder of 636.
The next digit of our result is 2. 
Result so far: 332.0
If we take 1320 away from 1956, we end up with 636.
Bring next digit (3) of the dividend behind the 636 and repeat the process: 6363 / 660

Going ahead to step 7:
The number 660 fits into 6363 9 times, leaving a remainder of 423.
Use 9 as the next digit of our solution. 
Result so far: 3329.0
If we subtract 5940 from 6363, we get 423.
Append the next digit (7) from the dividend to 423 and continue with: 4237 / 660

On to step 8:
When dividing 4237 by 660, we get 6 with a remainder of 277.
Write down 6 as next digit of the result. 
Result so far: 33296.0
If we subtract 3960 from 4237, we get 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Moving on to step 9:
660 goes into 2770 4 times with a remainder of 130.
Put 4 as the next digit of the answer. 
Result so far: 33296.4
Deduct 2640 from 2770 and we're left with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

On to step 10:
1300 divided by 660 is 1 with a remainder of 640.
Use 1 as the next digit of our solution. 
Result so far: 33296.41
If we subtract 660 from 1300, we 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.

Moving on to step 11:
660 can be fit into 6400 9 times, resulting in a remainder of 460.
Put 9 as the next digit of the answer. 
Result so far: 33296.419
The remainder is 460 after subtracting 5940 from 6400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Moving on to step 12:
The number 660 fits into 4600 6 times, leaving a remainder of 640.
Record the quotient 6 as the next digit in the result. 
Result so far: 33296.4196
If we take 3960 away from 4600, we end up with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Moving on to step 13:
6400 divided by 660 is 9 with a remainder of 460.
Record the quotient 9 as the next digit in the result. 
Result so far: 33296.41969
Subtract 5940 from 6400 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Step 14:
660 goes into 4600 6 times with a remainder of 640.
Record the quotient 6 as the next digit in the result. 
Result so far: 33296.419696
If we take 3960 away from 4600, we end up with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Let's proceed to step 15:
If we divide 6400 by 660, we get 9 and a remainder of 460.
Use 9 as the next digit of our solution. 
Result so far: 33296.4196969
Subtracting 5940 from 6400 leaves us with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

On to step 16:
If we divide 4600 by 660, we get 6 and a remainder of 640.
The next digit of our result is 6. 
Result so far: 33296.41969696
Subtract 3960 from 4600 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.

Our division results in 33296.41969696 with a remaining 6.4e-07.