We look at the division of 73857982 by 858 
The aim is to understand the frequency of 858 in 73857982.

On to step 1:
The number 858 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 858

Advancing to step 2:
If we divide 73 by 858, we get 0 and a remainder of 73.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 73, we end up with 73.
Append the next digit (8) from the dividend to 73 and continue with: 738 / 858

Going ahead to step 3:
738 divided by 858 is 0 with a remainder of 738.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 738, we end up with 738.
Append the next digit (5) from the dividend to 738 and continue with: 7385 / 858

Going ahead to step 4:
If we divide 7385 by 858, we get 8 and a remainder of 521.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 6864 away from 7385, we end up with 521.
Include the next digit (7) from the dividend after 521, then repeat: 5217 / 858

Moving on to step 5:
858 can be fit into 5217 6 times, resulting in a remainder of 69.
The number 6 becomes the next digit in our result. 
Result so far: 86.0
Deduct 5148 from 5217 and we're left with 69.
Take the next digit (9) from the dividend and append it to 69, then repeat: 699 / 858

On to step 6:
858 can be fit into 699 0 times, resulting in a remainder of 699.
Use 0 as the next digit of our solution. 
Result so far: 860.0
Subtracting 0 from 699 leaves us with 699.
Take the next digit (8) from the dividend and append it to 699, then repeat: 6998 / 858

Step 7:
858 can be fit into 6998 8 times, resulting in a remainder of 134.
Put 8 as the next digit of the answer. 
Result so far: 8608.0
The remainder is 134 after subtracting 6864 from 6998.
Include the next digit (2) from the dividend after 134, then repeat: 1342 / 858

Moving on to step 8:
1342 divided by 858 is 1 with a remainder of 484.
Write down 1 as next digit of the result. 
Result so far: 86081.0
Deduct 858 from 1342 and we're left with 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Advancing to step 9:
If we divide 4840 by 858, we get 5 and a remainder of 550.
The next digit of our result is 5. 
Result so far: 86081.5
Deduct 4290 from 4840 and we're left with 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Step 10:
858 goes into 5500 6 times with a remainder of 352.
Record the quotient 6 as the next digit in the result. 
Result so far: 86081.56
The remainder is 352 after subtracting 5148 from 5500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Going ahead to step 11:
3520 divided by 858 is 4 with a remainder of 88.
The next digit of our result is 4. 
Result so far: 86081.564
Subtract 3432 from 3520 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 12:
When dividing 880 by 858, we get 1 with a remainder of 22.
Put 1 as the next digit of the answer. 
Result so far: 86081.5641
The remainder is 22 after subtracting 858 from 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 13:
The number 858 fits into 220 0 times, leaving a remainder of 220.
The next digit of our result is 0. 
Result so far: 86081.5641
Deduct 0 from 220 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 14:
858 can be fit into 2200 2 times, resulting in a remainder of 484.
The next digit of our result is 2. 
Result so far: 86081.564102
Deduct 1716 from 2200 and we're left with 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Going ahead to step 15:
If we divide 4840 by 858, we get 5 and a remainder of 550.
Record the quotient 5 as the next digit in the result. 
Result so far: 86081.5641025
If we subtract 4290 from 4840, we get 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Moving on to step 16:
858 goes into 5500 6 times with a remainder of 352.
The next digit of our result is 6. 
Result so far: 86081.56410256
If we take 5148 away from 5500, we end up with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

In conclusion, the division gives 86081.56410256 with a balance of 3.52e-07.