80668114 ÷ 390 
The aim is to understand the frequency of 390 in 80668114.

Let's proceed to step 1:
When dividing 8 by 390, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 390

Going ahead to step 2:
The number 390 fits into 80 0 times, leaving a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 80 to get 80.
Include the next digit (6) from the dividend after 80, then repeat: 806 / 390

Advancing to step 3:
806 divided by 390 is 2 with a remainder of 26.
The next digit of our result is 2. 
Result so far: 2.0
If we take 780 away from 806, we end up with 26.
Take the next digit (6) from the dividend and append it to 26, then repeat: 266 / 390

Moving on to step 4:
If we divide 266 by 390, we get 0 and a remainder of 266.
Write down 0 as next digit of the result. 
Result so far: 20.0
Deduct 0 from 266 and we're left with 266.
Include the next digit (8) from the dividend after 266, then repeat: 2668 / 390

Going ahead to step 5:
390 goes into 2668 6 times with a remainder of 328.
Use 6 as the next digit of our solution. 
Result so far: 206.0
If we subtract 2340 from 2668, we get 328.
Append the next digit (1) from the dividend to 328 and continue with: 3281 / 390

On to step 6:
When dividing 3281 by 390, we get 8 with a remainder of 161.
Record the quotient 8 as the next digit in the result. 
Result so far: 2068.0
If we subtract 3120 from 3281, we get 161.
Bring next digit (1) of the dividend behind the 161 and repeat the process: 1611 / 390

Going ahead to step 7:
The number 390 fits into 1611 4 times, leaving a remainder of 51.
The number 4 becomes the next digit in our result. 
Result so far: 20684.0
The remainder is 51 after subtracting 1560 from 1611.
Grab the next digit (4) from the dividend, add it to 51, then carry on: 514 / 390

Step 8:
390 can be fit into 514 1 times, resulting in a remainder of 124.
The number 1 becomes the next digit in our result. 
Result so far: 206841.0
Subtract 390 from 514 to get 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

On to step 9:
390 goes into 1240 3 times with a remainder of 70.
Record the quotient 3 as the next digit in the result. 
Result so far: 206841.3
If we take 1170 away from 1240, 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.

Moving on to step 10:
390 can be fit into 700 1 times, resulting in a remainder of 310.
The next digit of our result is 1. 
Result so far: 206841.31
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.

Let's proceed to step 11:
If we divide 3100 by 390, we get 7 and a remainder of 370.
Record the quotient 7 as the next digit in the result. 
Result so far: 206841.317
Subtract 2730 from 3100 to get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Going ahead to step 12:
The number 390 fits into 3700 9 times, leaving a remainder of 190.
Record the quotient 9 as the next digit in the result. 
Result so far: 206841.3179
Subtract 3510 from 3700 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Advancing to step 13:
The number 390 fits into 1900 4 times, leaving a remainder of 340.
Record the quotient 4 as the next digit in the result. 
Result so far: 206841.31794
Subtract 1560 from 1900 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.

Going ahead to step 14:
If we divide 3400 by 390, we get 8 and a remainder of 280.
Put 8 as the next digit of the answer. 
Result so far: 206841.317948
If we subtract 3120 from 3400, we get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Going ahead to step 15:
The number 390 fits into 2800 7 times, leaving a remainder of 70.
The next digit of our result is 7. 
Result so far: 206841.3179487
Subtract 2730 from 2800 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 16:
If we divide 700 by 390, we get 1 and a remainder of 310.
Write down 1 as next digit of the result. 
Result so far: 206841.31794871
Subtracting 390 from 700 leaves us with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

The final outcome is 206841.31794871, with a leftover of 3.1e-07.