63578397 ÷ 660 
The aim is to understand the frequency of 660 in 63578397.

Going ahead to step 1:
If we divide 6 by 660, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 660

Let's proceed to step 2:
When dividing 63 by 660, we get 0 with a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 63 to get 63.
Include the next digit (5) from the dividend after 63, then repeat: 635 / 660

Going ahead to step 3:
660 goes into 635 0 times with a remainder of 635.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 635 to get 635.
Grab the next digit (7) from the dividend, add it to 635, then carry on: 6357 / 660

Going ahead to step 4:
The number 660 fits into 6357 9 times, leaving a remainder of 417.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 5940 from 6357 and we're left with 417.
Append the next digit (8) from the dividend to 417 and continue with: 4178 / 660

Moving on to step 5:
If we divide 4178 by 660, we get 6 and a remainder of 218.
Put 6 as the next digit of the answer. 
Result so far: 96.0
Deduct 3960 from 4178 and we're left with 218.
Take the next digit (3) from the dividend and append it to 218, then repeat: 2183 / 660

On to step 6:
The number 660 fits into 2183 3 times, leaving a remainder of 203.
Record the quotient 3 as the next digit in the result. 
Result so far: 963.0
Subtracting 1980 from 2183 leaves us with 203.
Bring next digit (9) of the dividend behind the 203 and repeat the process: 2039 / 660

On to step 7:
2039 divided by 660 is 3 with a remainder of 59.
Put 3 as the next digit of the answer. 
Result so far: 9633.0
Subtract 1980 from 2039 to get 59.
Fetch the next digit (7) from the dividend, attach it to 59 and continue: 597 / 660

Advancing to step 8:
The number 660 fits into 597 0 times, leaving a remainder of 597.
Write down 0 as next digit of the result. 
Result so far: 96330.0
Subtracting 0 from 597 leaves us with 597.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5970, and continue the process.

Going ahead to step 9:
If we divide 5970 by 660, we get 9 and a remainder of 30.
Write down 9 as next digit of the result. 
Result so far: 96330.9
Deduct 5940 from 5970 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
660 can be fit into 300 0 times, resulting in a remainder of 300.
The next digit of our result is 0. 
Result so far: 96330.9
Subtracting 0 from 300 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

On to step 11:
660 goes into 3000 4 times with a remainder of 360.
The number 4 becomes the next digit in our result. 
Result so far: 96330.904
Subtracting 2640 from 3000 leaves us with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Let's proceed to step 12:
3600 divided by 660 is 5 with a remainder of 300.
The number 5 becomes the next digit in our result. 
Result so far: 96330.9045
Subtracting 3300 from 3600 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Advancing to step 13:
660 goes into 3000 4 times with a remainder of 360.
The number 4 becomes the next digit in our result. 
Result so far: 96330.90454
If we take 2640 away from 3000, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Moving on to step 14:
If we divide 3600 by 660, we get 5 and a remainder of 300.
The number 5 becomes the next digit in our result. 
Result so far: 96330.904545
Subtract 3300 from 3600 to get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 15:
The number 660 fits into 3000 4 times, leaving a remainder of 360.
Use 4 as the next digit of our solution. 
Result so far: 96330.9045454
If we take 2640 away from 3000, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 16:
660 goes into 3600 5 times with a remainder of 300.
The number 5 becomes the next digit in our result. 
Result so far: 96330.90454545
Deduct 3300 from 3600 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

In conclusion, the division gives 96330.90454545 with a balance of 3e-07.