We look at the division of 873575 by 78 
The aim is to understand the frequency of 78 in 873575.

Let's proceed to step 1:
78 goes into 8 0 times 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.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 78

Going ahead to step 2:
If we divide 87 by 78, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 78 from 87 to get 9.
Grab the next digit (3) from the dividend, add it to 9, then carry on: 93 / 78

Let's proceed to step 3:
93 divided by 78 is 1 with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
If we subtract 78 from 93, we get 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 78

Going ahead to step 4:
If we divide 155 by 78, we get 1 and a remainder of 77.
The number 1 becomes the next digit in our result. 
Result so far: 111.0
Subtract 78 from 155 to get 77.
Include the next digit (7) from the dividend after 77, then repeat: 777 / 78

Moving on to step 5:
78 goes into 777 9 times with a remainder of 75.
The next digit of our result is 9. 
Result so far: 1119.0
If we subtract 702 from 777, we get 75.
Take the next digit (5) from the dividend and append it to 75, then repeat: 755 / 78

On to step 6:
78 can be fit into 755 9 times, resulting in a remainder of 53.
Use 9 as the next digit of our solution. 
Result so far: 11199.0
If we subtract 702 from 755, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Going ahead to step 7:
78 goes into 530 6 times with a remainder of 62.
Use 6 as the next digit of our solution. 
Result so far: 11199.6
If we subtract 468 from 530, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 8:
If we divide 620 by 78, we get 7 and a remainder of 74.
Record the quotient 7 as the next digit in the result. 
Result so far: 11199.67
Deduct 546 from 620 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 9:
When dividing 740 by 78, we get 9 with a remainder of 38.
Put 9 as the next digit of the answer. 
Result so far: 11199.679
Subtract 702 from 740 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 10:
If we divide 380 by 78, we get 4 and a remainder of 68.
The number 4 becomes the next digit in our result. 
Result so far: 11199.6794
Deduct 312 from 380 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Going ahead to step 11:
When dividing 680 by 78, we get 8 with a remainder of 56.
Use 8 as the next digit of our solution. 
Result so far: 11199.67948
If we take 624 away from 680, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 12:
78 goes into 560 7 times with a remainder of 14.
The next digit of our result is 7. 
Result so far: 11199.679487
Subtract 546 from 560 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 13:
If we divide 140 by 78, we get 1 and a remainder of 62.
Use 1 as the next digit of our solution. 
Result so far: 11199.6794871
Subtracting 78 from 140 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 14:
620 divided by 78 is 7 with a remainder of 74.
Record the quotient 7 as the next digit in the result. 
Result so far: 11199.67948717
The remainder is 74 after subtracting 546 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

After the division, we end up with 11199.67948717 and a remainder of 7.4e-08.