84597873 ÷ 858 
The aim is to understand the frequency of 858 in 84597873.

Let's proceed to step 1:
When dividing 8 by 858, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 858

On to step 2:
84 divided by 858 is 0 with a remainder of 84.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 84, we end up with 84.
Append the next digit (5) from the dividend to 84 and continue with: 845 / 858

Advancing to step 3:
858 goes into 845 0 times with a remainder of 845.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 845, we get 845.
Bring next digit (9) of the dividend behind the 845 and repeat the process: 8459 / 858

Moving on to step 4:
858 goes into 8459 9 times with a remainder of 737.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we take 7722 away from 8459, we end up with 737.
Bring next digit (7) of the dividend behind the 737 and repeat the process: 7377 / 858

Moving on to step 5:
The number 858 fits into 7377 8 times, leaving a remainder of 513.
The next digit of our result is 8. 
Result so far: 98.0
The remainder is 513 after subtracting 6864 from 7377.
Take the next digit (8) from the dividend and append it to 513, then repeat: 5138 / 858

Advancing to step 6:
The number 858 fits into 5138 5 times, leaving a remainder of 848.
The number 5 becomes the next digit in our result. 
Result so far: 985.0
Subtracting 4290 from 5138 leaves us with 848.
Grab the next digit (7) from the dividend, add it to 848, then carry on: 8487 / 858

Advancing to step 7:
The number 858 fits into 8487 9 times, leaving a remainder of 765.
Put 9 as the next digit of the answer. 
Result so far: 9859.0
If we take 7722 away from 8487, we end up with 765.
Bring next digit (3) of the dividend behind the 765 and repeat the process: 7653 / 858

On to step 8:
7653 divided by 858 is 8 with a remainder of 789.
Record the quotient 8 as the next digit in the result. 
Result so far: 98598.0
The remainder is 789 after subtracting 6864 from 7653.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7890, and continue the process.

Advancing to step 9:
If we divide 7890 by 858, we get 9 and a remainder of 168.
The number 9 becomes the next digit in our result. 
Result so far: 98598.9
Deduct 7722 from 7890 and we're left with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Going ahead to step 10:
858 goes into 1680 1 times with a remainder of 822.
Record the quotient 1 as the next digit in the result. 
Result so far: 98598.91
Subtract 858 from 1680 to get 822.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8220, and continue the process.

Advancing to step 11:
858 can be fit into 8220 9 times, resulting in a remainder of 498.
The next digit of our result is 9. 
Result so far: 98598.919
If we take 7722 away from 8220, we end up with 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Advancing to step 12:
858 can be fit into 4980 5 times, resulting in a remainder of 690.
The number 5 becomes the next digit in our result. 
Result so far: 98598.9195
Subtract 4290 from 4980 to get 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6900, and continue the process.

Advancing to step 13:
When dividing 6900 by 858, we get 8 with a remainder of 36.
Put 8 as the next digit of the answer. 
Result so far: 98598.91958
If we take 6864 away from 6900, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 14:
858 goes into 360 0 times with a remainder of 360.
The next digit of our result is 0. 
Result so far: 98598.91958
If we take 0 away from 360, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 15:
If we divide 3600 by 858, we get 4 and a remainder of 168.
Record the quotient 4 as the next digit in the result. 
Result so far: 98598.9195804
The remainder is 168 after subtracting 3432 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Moving on to step 16:
858 can be fit into 1680 1 times, resulting in a remainder of 822.
The next digit of our result is 1. 
Result so far: 98598.91958041
Subtract 858 from 1680 to get 822.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8220, and continue the process.

The final result is 98598.91958041 with a remainder of 8.22e-07.