We look at the division of 69386790 by 391 
The aim is to understand the frequency of 391 in 69386790.

Going ahead to step 1:
391 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 391

Going ahead to step 2:
391 can be fit into 69 0 times, resulting in a remainder of 69.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 69, we get 69.
Bring next digit (3) of the dividend behind the 69 and repeat the process: 693 / 391

Step 3:
693 divided by 391 is 1 with a remainder of 302.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 391 from 693 leaves us with 302.
Fetch the next digit (8) from the dividend, attach it to 302 and continue: 3028 / 391

Moving on to step 4:
When dividing 3028 by 391, we get 7 with a remainder of 291.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we take 2737 away from 3028, we end up with 291.
Bring next digit (6) of the dividend behind the 291 and repeat the process: 2916 / 391

On to step 5:
If we divide 2916 by 391, we get 7 and a remainder of 179.
The next digit of our result is 7. 
Result so far: 177.0
If we subtract 2737 from 2916, we get 179.
Bring next digit (7) of the dividend behind the 179 and repeat the process: 1797 / 391

Moving on to step 6:
The number 391 fits into 1797 4 times, leaving a remainder of 233.
Put 4 as the next digit of the answer. 
Result so far: 1774.0
If we take 1564 away from 1797, we end up with 233.
Append the next digit (9) from the dividend to 233 and continue with: 2339 / 391

Moving on to step 7:
391 goes into 2339 5 times with a remainder of 384.
Use 5 as the next digit of our solution. 
Result so far: 17745.0
Subtracting 1955 from 2339 leaves us with 384.
Take the next digit (0) from the dividend and append it to 384, then repeat: 3840 / 391

On to step 8:
When dividing 3840 by 391, we get 9 with a remainder of 321.
The next digit of our result is 9. 
Result so far: 177459.0
Deduct 3519 from 3840 and we're left with 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

On to step 9:
The number 391 fits into 3210 8 times, leaving a remainder of 82.
Use 8 as the next digit of our solution. 
Result so far: 177459.8
If we take 3128 away from 3210, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 10:
When dividing 820 by 391, we get 2 with a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 177459.82
Subtracting 782 from 820 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 11:
391 goes into 380 0 times with a remainder of 380.
The next digit of our result is 0. 
Result so far: 177459.82
The remainder is 380 after subtracting 0 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Step 12:
When dividing 3800 by 391, we get 9 with a remainder of 281.
Write down 9 as next digit of the result. 
Result so far: 177459.8209
Subtracting 3519 from 3800 leaves us with 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Going ahead to step 13:
391 can be fit into 2810 7 times, resulting in a remainder of 73.
The number 7 becomes the next digit in our result. 
Result so far: 177459.82097
Deduct 2737 from 2810 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 14:
391 goes into 730 1 times with a remainder of 339.
Use 1 as the next digit of our solution. 
Result so far: 177459.820971
If we subtract 391 from 730, we get 339.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3390, and continue the process.

Moving on to step 15:
391 can be fit into 3390 8 times, resulting in a remainder of 262.
The next digit of our result is 8. 
Result so far: 177459.8209718
Subtract 3128 from 3390 to get 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Going ahead to step 16:
2620 divided by 391 is 6 with a remainder of 274.
The next digit of our result is 6. 
Result so far: 177459.82097186
If we take 2346 away from 2620, we end up with 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Our division results in 177459.82097186 with a remaining 2.74e-07.