We're dividing 80253654 by 879 
The aim is to understand the frequency of 879 in 80253654.

Advancing to step 1:
If we divide 8 by 879, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 879

Advancing to step 2:
The number 879 fits into 80 0 times, leaving a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Fetch the next digit (2) from the dividend, attach it to 80 and continue: 802 / 879

Step 3:
If we divide 802 by 879, we get 0 and a remainder of 802.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 802 and we're left with 802.
Bring next digit (5) of the dividend behind the 802 and repeat the process: 8025 / 879

Moving on to step 4:
If we divide 8025 by 879, we get 9 and a remainder of 114.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we take 7911 away from 8025, we end up with 114.
Bring next digit (3) of the dividend behind the 114 and repeat the process: 1143 / 879

Let's proceed to step 5:
When dividing 1143 by 879, we get 1 with a remainder of 264.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
If we subtract 879 from 1143, we get 264.
Include the next digit (6) from the dividend after 264, then repeat: 2646 / 879

On to step 6:
When dividing 2646 by 879, we get 3 with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 913.0
Deduct 2637 from 2646 and we're left with 9.
Grab the next digit (5) from the dividend, add it to 9, then carry on: 95 / 879

On to step 7:
If we divide 95 by 879, we get 0 and a remainder of 95.
Write down 0 as next digit of the result. 
Result so far: 9130.0
If we take 0 away from 95, we end up with 95.
Include the next digit (4) from the dividend after 95, then repeat: 954 / 879

Going ahead to step 8:
954 divided by 879 is 1 with a remainder of 75.
The next digit of our result is 1. 
Result so far: 91301.0
If we take 879 away from 954, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 9:
879 can be fit into 750 0 times, resulting in a remainder of 750.
Write down 0 as next digit of the result. 
Result so far: 91301.0
If we take 0 away from 750, we end up with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Advancing to step 10:
7500 divided by 879 is 8 with a remainder of 468.
The next digit of our result is 8. 
Result so far: 91301.08
Deduct 7032 from 7500 and we're left with 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

Advancing to step 11:
879 can be fit into 4680 5 times, resulting in a remainder of 285.
Record the quotient 5 as the next digit in the result. 
Result so far: 91301.085
Subtract 4395 from 4680 to get 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

Step 12:
879 goes into 2850 3 times with a remainder of 213.
Write down 3 as next digit of the result. 
Result so far: 91301.0853
Subtract 2637 from 2850 to get 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Advancing to step 13:
2130 divided by 879 is 2 with a remainder of 372.
The number 2 becomes the next digit in our result. 
Result so far: 91301.08532
The remainder is 372 after subtracting 1758 from 2130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Going ahead to step 14:
When dividing 3720 by 879, we get 4 with a remainder of 204.
The next digit of our result is 4. 
Result so far: 91301.085324
If we subtract 3516 from 3720, we get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

On to step 15:
The number 879 fits into 2040 2 times, leaving a remainder of 282.
Put 2 as the next digit of the answer. 
Result so far: 91301.0853242
Subtract 1758 from 2040 to get 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Step 16:
879 can be fit into 2820 3 times, resulting in a remainder of 183.
Write down 3 as next digit of the result. 
Result so far: 91301.08532423
Deduct 2637 from 2820 and we're left with 183.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1830, and continue the process.

After the division, we end up with 91301.08532423 and a remainder of 1.83e-07.