We look at the division of 85594569 by 390 
The aim is to understand the frequency of 390 in 85594569.

Let's proceed to step 1:
8 divided by 390 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 390

Going ahead to step 2:
When dividing 85 by 390, we get 0 with a remainder of 85.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Take the next digit (5) from the dividend and append it to 85, then repeat: 855 / 390

Advancing to step 3:
When dividing 855 by 390, we get 2 with a remainder of 75.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 780 from 855, we get 75.
Include the next digit (9) from the dividend after 75, then repeat: 759 / 390

Going ahead to step 4:
If we divide 759 by 390, we get 1 and a remainder of 369.
Write down 1 as next digit of the result. 
Result so far: 21.0
Subtract 390 from 759 to get 369.
Append the next digit (4) from the dividend to 369 and continue with: 3694 / 390

Step 5:
If we divide 3694 by 390, we get 9 and a remainder of 184.
Put 9 as the next digit of the answer. 
Result so far: 219.0
The remainder is 184 after subtracting 3510 from 3694.
Bring next digit (5) of the dividend behind the 184 and repeat the process: 1845 / 390

Step 6:
1845 divided by 390 is 4 with a remainder of 285.
The next digit of our result is 4. 
Result so far: 2194.0
Subtract 1560 from 1845 to get 285.
Fetch the next digit (6) from the dividend, attach it to 285 and continue: 2856 / 390

Going ahead to step 7:
2856 divided by 390 is 7 with a remainder of 126.
The number 7 becomes the next digit in our result. 
Result so far: 21947.0
If we take 2730 away from 2856, we end up with 126.
Append the next digit (9) from the dividend to 126 and continue with: 1269 / 390

On to step 8:
The number 390 fits into 1269 3 times, leaving a remainder of 99.
Record the quotient 3 as the next digit in the result. 
Result so far: 219473.0
If we subtract 1170 from 1269, we get 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Step 9:
990 divided by 390 is 2 with a remainder of 210.
Use 2 as the next digit of our solution. 
Result so far: 219473.2
The remainder is 210 after subtracting 780 from 990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Moving on to step 10:
390 goes into 2100 5 times with a remainder of 150.
Put 5 as the next digit of the answer. 
Result so far: 219473.25
Subtract 1950 from 2100 to get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Let's proceed to step 11:
When dividing 1500 by 390, we get 3 with a remainder of 330.
The number 3 becomes the next digit in our result. 
Result so far: 219473.253
The remainder is 330 after subtracting 1170 from 1500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Moving on to step 12:
390 can be fit into 3300 8 times, resulting in a remainder of 180.
Use 8 as the next digit of our solution. 
Result so far: 219473.2538
Subtracting 3120 from 3300 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 13:
1800 divided by 390 is 4 with a remainder of 240.
Use 4 as the next digit of our solution. 
Result so far: 219473.25384
Deduct 1560 from 1800 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Advancing to step 14:
390 goes into 2400 6 times with a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 219473.253846
If we take 2340 away from 2400, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 15:
When dividing 600 by 390, we get 1 with a remainder of 210.
The number 1 becomes the next digit in our result. 
Result so far: 219473.2538461
The remainder is 210 after subtracting 390 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Moving on to step 16:
390 can be fit into 2100 5 times, resulting in a remainder of 150.
The next digit of our result is 5. 
Result so far: 219473.25384615
If we take 1950 away from 2100, we end up with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

The final result is 219473.25384615 with a remainder of 1.5e-07.