We look at the division of 64412642 by 791 
The aim is to understand the frequency of 791 in 64412642.

Going ahead to step 1:
When dividing 6 by 791, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 791

Advancing to step 2:
64 divided by 791 is 0 with a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Include the next digit (4) from the dividend after 64, then repeat: 644 / 791

Going ahead to step 3:
When dividing 644 by 791, we get 0 with a remainder of 644.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 644 after subtracting 0 from 644.
Bring next digit (1) of the dividend behind the 644 and repeat the process: 6441 / 791

On to step 4:
6441 divided by 791 is 8 with a remainder of 113.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtract 6328 from 6441 to get 113.
Append the next digit (2) from the dividend to 113 and continue with: 1132 / 791

Let's proceed to step 5:
The number 791 fits into 1132 1 times, leaving a remainder of 341.
Put 1 as the next digit of the answer. 
Result so far: 81.0
Subtract 791 from 1132 to get 341.
Include the next digit (6) from the dividend after 341, then repeat: 3416 / 791

Going ahead to step 6:
The number 791 fits into 3416 4 times, leaving a remainder of 252.
Use 4 as the next digit of our solution. 
Result so far: 814.0
The remainder is 252 after subtracting 3164 from 3416.
Grab the next digit (4) from the dividend, add it to 252, then carry on: 2524 / 791

Moving on to step 7:
791 goes into 2524 3 times with a remainder of 151.
Put 3 as the next digit of the answer. 
Result so far: 8143.0
Subtract 2373 from 2524 to get 151.
Grab the next digit (2) from the dividend, add it to 151, then carry on: 1512 / 791

Advancing to step 8:
If we divide 1512 by 791, we get 1 and a remainder of 721.
Record the quotient 1 as the next digit in the result. 
Result so far: 81431.0
Deduct 791 from 1512 and we're left with 721.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7210, and continue the process.

Advancing to step 9:
791 goes into 7210 9 times with a remainder of 91.
Use 9 as the next digit of our solution. 
Result so far: 81431.9
The remainder is 91 after subtracting 7119 from 7210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Let's proceed to step 10:
If we divide 910 by 791, we get 1 and a remainder of 119.
The number 1 becomes the next digit in our result. 
Result so far: 81431.91
If we take 791 away from 910, we end up with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Step 11:
If we divide 1190 by 791, we get 1 and a remainder of 399.
Put 1 as the next digit of the answer. 
Result so far: 81431.911
The remainder is 399 after subtracting 791 from 1190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3990, and continue the process.

The final result is 81431.911 with a remainder of 0.0399.