618291 divided by 13 
The aim is to understand the frequency of 13 in 618291.

Step 1:
13 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 13

Going ahead to step 2:
13 can be fit into 61 4 times, resulting in a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 52 from 61 and we're left with 9.
Fetch the next digit (8) from the dividend, attach it to 9 and continue: 98 / 13

On to step 3:
98 divided by 13 is 7 with a remainder of 7.
The number 7 becomes the next digit in our result. 
Result so far: 47.0
Subtract 91 from 98 to get 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 13

Advancing to step 4:
13 goes into 72 5 times with a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 475.0
If we take 65 away from 72, we end up with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 13

On to step 5:
The number 13 fits into 79 6 times, leaving a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 4756.0
The remainder is 1 after subtracting 78 from 79.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 13

Advancing to step 6:
13 can be fit into 11 0 times, resulting in a remainder of 11.
The next digit of our result is 0. 
Result so far: 47560.0
If we take 0 away from 11, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
If we divide 110 by 13, we get 8 and a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 47560.8
Deduct 104 from 110 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
The number 13 fits into 60 4 times, leaving a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 47560.84
Subtract 52 from 60 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 9:
13 can be fit into 80 6 times, resulting in a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 47560.846
If we take 78 away from 80, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 10:
When dividing 20 by 13, we get 1 with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 47560.8461
If we subtract 13 from 20, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 11:
When dividing 70 by 13, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 47560.84615
Subtract 65 from 70 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 12:
13 goes into 50 3 times with a remainder of 11.
The next digit of our result is 3. 
Result so far: 47560.846153
If we subtract 39 from 50, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 13:
The number 13 fits into 110 8 times, leaving a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 47560.8461538
If we take 104 away from 110, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 14:
60 divided by 13 is 4 with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 47560.84615384
Subtract 52 from 60 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 47560.84615384 with a remainder of 8e-09.