80667318 ÷ 390 
The aim is to understand the frequency of 390 in 80667318.

Moving on to step 1:
If we divide 8 by 390, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 390

On to step 2:
390 can be fit into 80 0 times, resulting in a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 80 and we're left with 80.
Bring next digit (6) of the dividend behind the 80 and repeat the process: 806 / 390

Going ahead to step 3:
If we divide 806 by 390, we get 2 and a remainder of 26.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 780 from 806 and we're left with 26.
Grab the next digit (6) from the dividend, add it to 26, then carry on: 266 / 390

Let's proceed to step 4:
If we divide 266 by 390, we get 0 and a remainder of 266.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Subtract 0 from 266 to get 266.
Append the next digit (7) from the dividend to 266 and continue with: 2667 / 390

Let's proceed to step 5:
390 can be fit into 2667 6 times, resulting in a remainder of 327.
Use 6 as the next digit of our solution. 
Result so far: 206.0
Deduct 2340 from 2667 and we're left with 327.
Fetch the next digit (3) from the dividend, attach it to 327 and continue: 3273 / 390

Advancing to step 6:
3273 divided by 390 is 8 with a remainder of 153.
Use 8 as the next digit of our solution. 
Result so far: 2068.0
The remainder is 153 after subtracting 3120 from 3273.
Include the next digit (1) from the dividend after 153, then repeat: 1531 / 390

Going ahead to step 7:
The number 390 fits into 1531 3 times, leaving a remainder of 361.
Put 3 as the next digit of the answer. 
Result so far: 20683.0
Deduct 1170 from 1531 and we're left with 361.
Append the next digit (8) from the dividend to 361 and continue with: 3618 / 390

On to step 8:
390 can be fit into 3618 9 times, resulting in a remainder of 108.
Use 9 as the next digit of our solution. 
Result so far: 206839.0
The remainder is 108 after subtracting 3510 from 3618.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Moving on to step 9:
390 can be fit into 1080 2 times, resulting in a remainder of 300.
Write down 2 as next digit of the result. 
Result so far: 206839.2
Deduct 780 from 1080 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.

Step 10:
The number 390 fits into 3000 7 times, leaving a remainder of 270.
Write down 7 as next digit of the result. 
Result so far: 206839.27
Deduct 2730 from 3000 and we're left with 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Going ahead to step 11:
390 goes into 2700 6 times with a remainder of 360.
Write down 6 as next digit of the result. 
Result so far: 206839.276
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.

Step 12:
3600 divided by 390 is 9 with a remainder of 90.
The next digit of our result is 9. 
Result so far: 206839.2769
The remainder is 90 after subtracting 3510 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Step 13:
If we divide 900 by 390, we get 2 and a remainder of 120.
Record the quotient 2 as the next digit in the result. 
Result so far: 206839.27692
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.

Advancing to step 14:
1200 divided by 390 is 3 with a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 206839.276923
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.

Let's proceed to step 15:
If we divide 300 by 390, we get 0 and a remainder of 300.
Record the quotient 0 as the next digit in the result. 
Result so far: 206839.276923
If we take 0 away from 300, we end up 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.

On to step 16:
When dividing 3000 by 390, we get 7 with a remainder of 270.
Write down 7 as next digit of the result. 
Result so far: 206839.27692307
If we take 2730 away from 3000, we end up with 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Our division results in 206839.27692307 with a remaining 2.7e-07.