We look at the division of 48815571 by 390 
The aim is to understand the frequency of 390 in 48815571.

Let's proceed to step 1:
390 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 390

On to step 2:
390 can be fit into 48 0 times, resulting in a remainder of 48.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 48 and we're left with 48.
Append the next digit (8) from the dividend to 48 and continue with: 488 / 390

Advancing to step 3:
390 goes into 488 1 times with a remainder of 98.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 390 from 488 leaves us with 98.
Append the next digit (1) from the dividend to 98 and continue with: 981 / 390

Step 4:
981 divided by 390 is 2 with a remainder of 201.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtracting 780 from 981 leaves us with 201.
Take the next digit (5) from the dividend and append it to 201, then repeat: 2015 / 390

On to step 5:
The number 390 fits into 2015 5 times, leaving a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 125.0
Deduct 1950 from 2015 and we're left with 65.
Take the next digit (5) from the dividend and append it to 65, then repeat: 655 / 390

Moving on to step 6:
390 can be fit into 655 1 times, resulting in a remainder of 265.
Use 1 as the next digit of our solution. 
Result so far: 1251.0
Subtract 390 from 655 to get 265.
Grab the next digit (7) from the dividend, add it to 265, then carry on: 2657 / 390

Step 7:
390 goes into 2657 6 times with a remainder of 317.
The number 6 becomes the next digit in our result. 
Result so far: 12516.0
Subtract 2340 from 2657 to get 317.
Take the next digit (1) from the dividend and append it to 317, then repeat: 3171 / 390

Going ahead to step 8:
When dividing 3171 by 390, we get 8 with a remainder of 51.
Use 8 as the next digit of our solution. 
Result so far: 125168.0
The remainder is 51 after subtracting 3120 from 3171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Moving on to step 9:
510 divided by 390 is 1 with a remainder of 120.
The number 1 becomes the next digit in our result. 
Result so far: 125168.1
Subtract 390 from 510 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 10:
If we divide 1200 by 390, we get 3 and a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 125168.13
Subtracting 1170 from 1200 leaves us 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.

Advancing to step 11:
390 goes into 300 0 times with a remainder of 300.
Write down 0 as next digit of the result. 
Result so far: 125168.13
Deduct 0 from 300 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.

Moving on to step 12:
390 goes into 3000 7 times with a remainder of 270.
Use 7 as the next digit of our solution. 
Result so far: 125168.1307
Subtract 2730 from 3000 to get 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Advancing to step 13:
The number 390 fits into 2700 6 times, leaving a remainder of 360.
Put 6 as the next digit of the answer. 
Result so far: 125168.13076
Deduct 2340 from 2700 and we're left 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 14:
390 can be fit into 3600 9 times, resulting in a remainder of 90.
Record the quotient 9 as the next digit in the result. 
Result so far: 125168.130769
If we subtract 3510 from 3600, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 15:
390 goes into 900 2 times with a remainder of 120.
The next digit of our result is 2. 
Result so far: 125168.1307692
Deduct 780 from 900 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 16:
390 can be fit into 1200 3 times, resulting in a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 125168.13076923
If we subtract 1170 from 1200, 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.

After the division, we end up with 125168.13076923 and a remainder of 3e-08.