Let's divide 90157291 by 391
The aim is to understand the frequency of 391 in 90157291.

Step 1:
391 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 391

Step 2:
If we divide 90 by 391, we get 0 and a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Fetch the next digit (1) from the dividend, attach it to 90 and continue: 901 / 391

On to step 3:
391 can be fit into 901 2 times, resulting in a remainder of 119.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 782 from 901 to get 119.
Fetch the next digit (5) from the dividend, attach it to 119 and continue: 1195 / 391

Let's proceed to step 4:
When dividing 1195 by 391, we get 3 with a remainder of 22.
Put 3 as the next digit of the answer. 
Result so far: 23.0
If we subtract 1173 from 1195, we get 22.
Grab the next digit (7) from the dividend, add it to 22, then carry on: 227 / 391

Step 5:
227 divided by 391 is 0 with a remainder of 227.
The next digit of our result is 0. 
Result so far: 230.0
Subtract 0 from 227 to get 227.
Bring next digit (2) of the dividend behind the 227 and repeat the process: 2272 / 391

On to step 6:
391 goes into 2272 5 times with a remainder of 317.
Write down 5 as next digit of the result. 
Result so far: 2305.0
If we take 1955 away from 2272, we end up with 317.
Include the next digit (9) from the dividend after 317, then repeat: 3179 / 391

On to step 7:
3179 divided by 391 is 8 with a remainder of 51.
The number 8 becomes the next digit in our result. 
Result so far: 23058.0
If we take 3128 away from 3179, we end up with 51.
Grab the next digit (1) from the dividend, add it to 51, then carry on: 511 / 391

Step 8:
391 can be fit into 511 1 times, resulting in a remainder of 120.
Put 1 as the next digit of the answer. 
Result so far: 230581.0
Deduct 391 from 511 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 9:
391 goes into 1200 3 times with a remainder of 27.
Put 3 as the next digit of the answer. 
Result so far: 230581.3
Subtracting 1173 from 1200 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 10:
When dividing 270 by 391, we get 0 with a remainder of 270.
Write down 0 as next digit of the result. 
Result so far: 230581.3
The remainder is 270 after subtracting 0 from 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Moving on to step 11:
When dividing 2700 by 391, we get 6 with a remainder of 354.
Use 6 as the next digit of our solution. 
Result so far: 230581.306
Subtract 2346 from 2700 to get 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Step 12:
If we divide 3540 by 391, we get 9 and a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 230581.3069
Subtracting 3519 from 3540 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 13:
391 goes into 210 0 times with a remainder of 210.
The number 0 becomes the next digit in our result. 
Result so far: 230581.3069
If we subtract 0 from 210, we get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Let's proceed to step 14:
When dividing 2100 by 391, we get 5 with a remainder of 145.
The number 5 becomes the next digit in our result. 
Result so far: 230581.306905
Deduct 1955 from 2100 and we're left with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Step 15:
1450 divided by 391 is 3 with a remainder of 277.
Put 3 as the next digit of the answer. 
Result so far: 230581.3069053
The remainder is 277 after subtracting 1173 from 1450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Let's proceed to step 16:
If we divide 2770 by 391, we get 7 and a remainder of 33.
Record the quotient 7 as the next digit in the result. 
Result so far: 230581.30690537
Subtracting 2737 from 2770 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

The final result is 230581.30690537 with a remainder of 3.3e-08.