10405819 divided by 390 
The aim is to understand the frequency of 390 in 10405819.

Going ahead to step 1:
If we divide 1 by 390, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 390

Let's proceed to step 2:
When dividing 10 by 390, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 10, we end up with 10.
Fetch the next digit (4) from the dividend, attach it to 10 and continue: 104 / 390

Going ahead to step 3:
390 goes into 104 0 times with a remainder of 104.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 104 leaves us with 104.
Grab the next digit (0) from the dividend, add it to 104, then carry on: 1040 / 390

Advancing to step 4:
1040 divided by 390 is 2 with a remainder of 260.
The next digit of our result is 2. 
Result so far: 2.0
If we take 780 away from 1040, we end up with 260.
Grab the next digit (5) from the dividend, add it to 260, then carry on: 2605 / 390

On to step 5:
390 can be fit into 2605 6 times, resulting in a remainder of 265.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
The remainder is 265 after subtracting 2340 from 2605.
Grab the next digit (8) from the dividend, add it to 265, then carry on: 2658 / 390

Moving on to step 6:
390 can be fit into 2658 6 times, resulting in a remainder of 318.
The next digit of our result is 6. 
Result so far: 266.0
The remainder is 318 after subtracting 2340 from 2658.
Take the next digit (1) from the dividend and append it to 318, then repeat: 3181 / 390

Advancing to step 7:
The number 390 fits into 3181 8 times, leaving a remainder of 61.
The next digit of our result is 8. 
Result so far: 2668.0
Subtract 3120 from 3181 to get 61.
Grab the next digit (9) from the dividend, add it to 61, then carry on: 619 / 390

On to step 8:
390 can be fit into 619 1 times, resulting in a remainder of 229.
The next digit of our result is 1. 
Result so far: 26681.0
Deduct 390 from 619 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

On to step 9:
390 can be fit into 2290 5 times, resulting in a remainder of 340.
The next digit of our result is 5. 
Result so far: 26681.5
Subtract 1950 from 2290 to get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Step 10:
When dividing 3400 by 390, we get 8 with a remainder of 280.
Write down 8 as next digit of the result. 
Result so far: 26681.58
Subtracting 3120 from 3400 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 11:
When dividing 2800 by 390, we get 7 with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 26681.587
If we take 2730 away from 2800, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 12:
390 goes into 700 1 times with a remainder of 310.
Write down 1 as next digit of the result. 
Result so far: 26681.5871
The remainder is 310 after subtracting 390 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

On to step 13:
3100 divided by 390 is 7 with a remainder of 370.
Record the quotient 7 as the next digit in the result. 
Result so far: 26681.58717
If we take 2730 away from 3100, we end up with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Let's proceed to step 14:
390 can be fit into 3700 9 times, resulting in a remainder of 190.
Put 9 as the next digit of the answer. 
Result so far: 26681.587179
Deduct 3510 from 3700 and we're left with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Let's proceed to step 15:
When dividing 1900 by 390, we get 4 with a remainder of 340.
The number 4 becomes the next digit in our result. 
Result so far: 26681.5871794
If we take 1560 away from 1900, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Moving on to step 16:
When dividing 3400 by 390, we get 8 with a remainder of 280.
Write down 8 as next digit of the result. 
Result so far: 26681.58717948
If we take 3120 away from 3400, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

In conclusion, the division gives 26681.58717948 with a balance of 2.8e-07.