We look at the division of 73172355 by 660 
The aim is to understand the frequency of 660 in 73172355.

Step 1:
7 divided by 660 is 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (3) of the dividend behind the 7 and repeat the process: 73 / 660

Moving on to step 2:
660 goes into 73 0 times with a remainder of 73.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 73 after subtracting 0 from 73.
Include the next digit (1) from the dividend after 73, then repeat: 731 / 660

Step 3:
731 divided by 660 is 1 with a remainder of 71.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 660 from 731 to get 71.
Grab the next digit (7) from the dividend, add it to 71, then carry on: 717 / 660

Step 4:
If we divide 717 by 660, we get 1 and a remainder of 57.
Write down 1 as next digit of the result. 
Result so far: 11.0
Subtract 660 from 717 to get 57.
Include the next digit (2) from the dividend after 57, then repeat: 572 / 660

Going ahead to step 5:
When dividing 572 by 660, we get 0 with a remainder of 572.
Use 0 as the next digit of our solution. 
Result so far: 110.0
Subtracting 0 from 572 leaves us with 572.
Bring next digit (3) of the dividend behind the 572 and repeat the process: 5723 / 660

On to step 6:
If we divide 5723 by 660, we get 8 and a remainder of 443.
The number 8 becomes the next digit in our result. 
Result so far: 1108.0
Subtract 5280 from 5723 to get 443.
Append the next digit (5) from the dividend to 443 and continue with: 4435 / 660

Step 7:
When dividing 4435 by 660, we get 6 with a remainder of 475.
Use 6 as the next digit of our solution. 
Result so far: 11086.0
Subtract 3960 from 4435 to get 475.
Include the next digit (5) from the dividend after 475, then repeat: 4755 / 660

Advancing to step 8:
When dividing 4755 by 660, we get 7 with a remainder of 135.
Record the quotient 7 as the next digit in the result. 
Result so far: 110867.0
If we take 4620 away from 4755, we end up with 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Going ahead to step 9:
If we divide 1350 by 660, we get 2 and a remainder of 30.
Write down 2 as next digit of the result. 
Result so far: 110867.2
If we subtract 1320 from 1350, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 10:
300 divided by 660 is 0 with a remainder of 300.
The number 0 becomes the next digit in our result. 
Result so far: 110867.2
Subtract 0 from 300 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.

On to step 11:
If we divide 3000 by 660, we get 4 and a remainder of 360.
Record the quotient 4 as the next digit in the result. 
Result so far: 110867.204
The remainder is 360 after subtracting 2640 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 12:
660 goes into 3600 5 times with a remainder of 300.
Use 5 as the next digit of our solution. 
Result so far: 110867.2045
If we subtract 3300 from 3600, we 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.

Going ahead to step 13:
3000 divided by 660 is 4 with a remainder of 360.
Put 4 as the next digit of the answer. 
Result so far: 110867.20454
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.

Step 14:
The number 660 fits into 3600 5 times, leaving a remainder of 300.
Record the quotient 5 as the next digit in the result. 
Result so far: 110867.204545
If we subtract 3300 from 3600, we 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.

Going ahead to step 15:
If we divide 3000 by 660, we get 4 and a remainder of 360.
Write down 4 as next digit of the result. 
Result so far: 110867.2045454
If we subtract 2640 from 3000, we get 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 16:
If we divide 3600 by 660, we get 5 and a remainder of 300.
The next digit of our result is 5. 
Result so far: 110867.20454545
If we subtract 3300 from 3600, we 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.

The quotient of the division is 110867.20454545, and the remainder is 3e-07.