18213508 ÷ 791 
The aim is to understand the frequency of 791 in 18213508.

On to step 1:
The number 791 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 791

Going ahead to step 2:
If we divide 18 by 791, we get 0 and a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Take the next digit (2) from the dividend and append it to 18, then repeat: 182 / 791

Going ahead to step 3:
When dividing 182 by 791, we get 0 with a remainder of 182.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 182, we get 182.
Append the next digit (1) from the dividend to 182 and continue with: 1821 / 791

Going ahead to step 4:
The number 791 fits into 1821 2 times, leaving a remainder of 239.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 1582 from 1821 and we're left with 239.
Include the next digit (3) from the dividend after 239, then repeat: 2393 / 791

On to step 5:
2393 divided by 791 is 3 with a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 23.0
If we take 2373 away from 2393, we end up with 20.
Fetch the next digit (5) from the dividend, attach it to 20 and continue: 205 / 791

On to step 6:
The number 791 fits into 205 0 times, leaving a remainder of 205.
Record the quotient 0 as the next digit in the result. 
Result so far: 230.0
Subtract 0 from 205 to get 205.
Grab the next digit (0) from the dividend, add it to 205, then carry on: 2050 / 791

Going ahead to step 7:
If we divide 2050 by 791, we get 2 and a remainder of 468.
Put 2 as the next digit of the answer. 
Result so far: 2302.0
The remainder is 468 after subtracting 1582 from 2050.
Grab the next digit (8) from the dividend, add it to 468, then carry on: 4688 / 791

Step 8:
If we divide 4688 by 791, we get 5 and a remainder of 733.
The next digit of our result is 5. 
Result so far: 23025.0
If we subtract 3955 from 4688, we get 733.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7330, and continue the process.

Moving on to step 9:
791 can be fit into 7330 9 times, resulting in a remainder of 211.
Put 9 as the next digit of the answer. 
Result so far: 23025.9
Subtract 7119 from 7330 to get 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

On to step 10:
When dividing 2110 by 791, we get 2 with a remainder of 528.
The number 2 becomes the next digit in our result. 
Result so far: 23025.92
If we subtract 1582 from 2110, we get 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

On to step 11:
791 can be fit into 5280 6 times, resulting in a remainder of 534.
Record the quotient 6 as the next digit in the result. 
Result so far: 23025.926
Subtracting 4746 from 5280 leaves us with 534.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5340, and continue the process.

Going ahead to step 12:
The number 791 fits into 5340 6 times, leaving a remainder of 594.
The next digit of our result is 6. 
Result so far: 23025.9266
The remainder is 594 after subtracting 4746 from 5340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5940, and continue the process.

The final result is 23025.9266 with a remainder of 0.00594.