87398321 divided by 807 
The aim is to understand the frequency of 807 in 87398321.

Step 1:
When dividing 8 by 807, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 807

Let's proceed to step 2:
If we divide 87 by 807, we get 0 and a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Fetch the next digit (3) from the dividend, attach it to 87 and continue: 873 / 807

Step 3:
873 divided by 807 is 1 with a remainder of 66.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 807 away from 873, we end up with 66.
Append the next digit (9) from the dividend to 66 and continue with: 669 / 807

Going ahead to step 4:
The number 807 fits into 669 0 times, leaving a remainder of 669.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 669, we get 669.
Grab the next digit (8) from the dividend, add it to 669, then carry on: 6698 / 807

Step 5:
If we divide 6698 by 807, we get 8 and a remainder of 242.
Record the quotient 8 as the next digit in the result. 
Result so far: 108.0
The remainder is 242 after subtracting 6456 from 6698.
Bring next digit (3) of the dividend behind the 242 and repeat the process: 2423 / 807

Moving on to step 6:
When dividing 2423 by 807, we get 3 with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 1083.0
The remainder is 2 after subtracting 2421 from 2423.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 807

Moving on to step 7:
22 divided by 807 is 0 with a remainder of 22.
Put 0 as the next digit of the answer. 
Result so far: 10830.0
Subtracting 0 from 22 leaves us with 22.
Include the next digit (1) from the dividend after 22, then repeat: 221 / 807

Step 8:
If we divide 221 by 807, we get 0 and a remainder of 221.
The next digit of our result is 0. 
Result so far: 108300.0
Subtract 0 from 221 to get 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

Let's proceed to step 9:
When dividing 2210 by 807, we get 2 with a remainder of 596.
Use 2 as the next digit of our solution. 
Result so far: 108300.2
If we subtract 1614 from 2210, we get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Going ahead to step 10:
The number 807 fits into 5960 7 times, leaving a remainder of 311.
The next digit of our result is 7. 
Result so far: 108300.27
If we subtract 5649 from 5960, we get 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

Advancing to step 11:
The number 807 fits into 3110 3 times, leaving a remainder of 689.
Put 3 as the next digit of the answer. 
Result so far: 108300.273
If we take 2421 away from 3110, we end up with 689.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6890, and continue the process.

Step 12:
807 can be fit into 6890 8 times, resulting in a remainder of 434.
Write down 8 as next digit of the result. 
Result so far: 108300.2738
Subtract 6456 from 6890 to get 434.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4340, and continue the process.

Going ahead to step 13:
When dividing 4340 by 807, we get 5 with a remainder of 305.
The number 5 becomes the next digit in our result. 
Result so far: 108300.27385
Subtract 4035 from 4340 to get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Moving on to step 14:
3050 divided by 807 is 3 with a remainder of 629.
The number 3 becomes the next digit in our result. 
Result so far: 108300.273853
Subtract 2421 from 3050 to get 629.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6290, and continue the process.

Going ahead to step 15:
807 goes into 6290 7 times with a remainder of 641.
Record the quotient 7 as the next digit in the result. 
Result so far: 108300.2738537
If we take 5649 away from 6290, we end up with 641.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6410, and continue the process.

Let's proceed to step 16:
6410 divided by 807 is 7 with a remainder of 761.
Put 7 as the next digit of the answer. 
Result so far: 108300.27385377
Deduct 5649 from 6410 and we're left with 761.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7610, and continue the process.

In conclusion, the division gives 108300.27385377 with a balance of 7.61e-07.