We look at the division of 66245553 by 371 
The aim is to understand the frequency of 371 in 66245553.

On to step 1:
6 divided by 371 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 371

Step 2:
When dividing 66 by 371, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (2) from the dividend after 66, then repeat: 662 / 371

Advancing to step 3:
662 divided by 371 is 1 with a remainder of 291.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 371 from 662 leaves us with 291.
Grab the next digit (4) from the dividend, add it to 291, then carry on: 2914 / 371

On to step 4:
371 goes into 2914 7 times with a remainder of 317.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
The remainder is 317 after subtracting 2597 from 2914.
Bring next digit (5) of the dividend behind the 317 and repeat the process: 3175 / 371

Let's proceed to step 5:
When dividing 3175 by 371, we get 8 with a remainder of 207.
Write down 8 as next digit of the result. 
Result so far: 178.0
The remainder is 207 after subtracting 2968 from 3175.
Include the next digit (5) from the dividend after 207, then repeat: 2075 / 371

Advancing to step 6:
2075 divided by 371 is 5 with a remainder of 220.
Record the quotient 5 as the next digit in the result. 
Result so far: 1785.0
Subtracting 1855 from 2075 leaves us with 220.
Bring next digit (5) of the dividend behind the 220 and repeat the process: 2205 / 371

Advancing to step 7:
371 goes into 2205 5 times with a remainder of 350.
Use 5 as the next digit of our solution. 
Result so far: 17855.0
If we take 1855 away from 2205, we end up with 350.
Include the next digit (3) from the dividend after 350, then repeat: 3503 / 371

Moving on to step 8:
371 goes into 3503 9 times with a remainder of 164.
The number 9 becomes the next digit in our result. 
Result so far: 178559.0
If we take 3339 away from 3503, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Advancing to step 9:
If we divide 1640 by 371, we get 4 and a remainder of 156.
Put 4 as the next digit of the answer. 
Result so far: 178559.4
Subtract 1484 from 1640 to get 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Moving on to step 10:
1560 divided by 371 is 4 with a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 178559.44
If we take 1484 away from 1560, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The quotient of the division is 178559.44, and the remainder is 0.076.