We look at the division of 89523997 by 390 
The aim is to understand the frequency of 390 in 89523997.

Advancing to step 1:
390 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 390

On to step 2:
89 divided by 390 is 0 with a remainder of 89.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 89 to get 89.
Append the next digit (5) from the dividend to 89 and continue with: 895 / 390

Advancing to step 3:
The number 390 fits into 895 2 times, leaving a remainder of 115.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 780 from 895 and we're left with 115.
Append the next digit (2) from the dividend to 115 and continue with: 1152 / 390

Moving on to step 4:
1152 divided by 390 is 2 with a remainder of 372.
Put 2 as the next digit of the answer. 
Result so far: 22.0
If we take 780 away from 1152, we end up with 372.
Include the next digit (3) from the dividend after 372, then repeat: 3723 / 390

Advancing to step 5:
If we divide 3723 by 390, we get 9 and a remainder of 213.
Write down 9 as next digit of the result. 
Result so far: 229.0
Subtract 3510 from 3723 to get 213.
Grab the next digit (9) from the dividend, add it to 213, then carry on: 2139 / 390

Let's proceed to step 6:
390 goes into 2139 5 times with a remainder of 189.
The number 5 becomes the next digit in our result. 
Result so far: 2295.0
Subtracting 1950 from 2139 leaves us with 189.
Take the next digit (9) from the dividend and append it to 189, then repeat: 1899 / 390

Moving on to step 7:
If we divide 1899 by 390, we get 4 and a remainder of 339.
Write down 4 as next digit of the result. 
Result so far: 22954.0
Subtracting 1560 from 1899 leaves us with 339.
Fetch the next digit (7) from the dividend, attach it to 339 and continue: 3397 / 390

On to step 8:
When dividing 3397 by 390, we get 8 with a remainder of 277.
Put 8 as the next digit of the answer. 
Result so far: 229548.0
The remainder is 277 after subtracting 3120 from 3397.
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:
The number 390 fits into 2770 7 times, leaving a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 229548.7
If we subtract 2730 from 2770, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 10:
400 divided by 390 is 1 with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 229548.71
Subtract 390 from 400 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 11:
100 divided by 390 is 0 with a remainder of 100.
Record the quotient 0 as the next digit in the result. 
Result so far: 229548.71
If we take 0 away from 100, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Going ahead to step 12:
If we divide 1000 by 390, we get 2 and a remainder of 220.
Record the quotient 2 as the next digit in the result. 
Result so far: 229548.7102
If we take 780 away from 1000, we end up with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Moving on to step 13:
When dividing 2200 by 390, we get 5 with a remainder of 250.
Use 5 as the next digit of our solution. 
Result so far: 229548.71025
If we subtract 1950 from 2200, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

On to step 14:
390 goes into 2500 6 times with a remainder of 160.
The next digit of our result is 6. 
Result so far: 229548.710256
If we subtract 2340 from 2500, we get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 15:
When dividing 1600 by 390, we get 4 with a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 229548.7102564
Deduct 1560 from 1600 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 16:
400 divided by 390 is 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 229548.71025641
The remainder is 10 after subtracting 390 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 229548.71025641 with a remainder of 1e-08.