858972 divided by 78 
The aim is to understand the frequency of 78 in 858972.

On to step 1:
If we divide 8 by 78, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 78

On to step 2:
If we divide 85 by 78, we get 1 and a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 78 from 85 and we're left with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 78

On to step 3:
78 can be fit into 78 1 times, resulting in a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 11.0
Subtract 78 from 78 to get 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 78

Going ahead to step 4:
When dividing 9 by 78, we get 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 110.0
If we subtract 0 from 9, we get 9.
Fetch the next digit (7) from the dividend, attach it to 9 and continue: 97 / 78

Advancing to step 5:
78 can be fit into 97 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1101.0
Subtract 78 from 97 to get 19.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 78

On to step 6:
78 can be fit into 192 2 times, resulting in a remainder of 36.
Write down 2 as next digit of the result. 
Result so far: 11012.0
If we take 156 away from 192, 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.

Step 7:
78 can be fit into 360 4 times, resulting in a remainder of 48.
The number 4 becomes the next digit in our result. 
Result so far: 11012.4
Subtract 312 from 360 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 8:
When dividing 480 by 78, we get 6 with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 11012.46
If we take 468 away from 480, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 9:
120 divided by 78 is 1 with a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 11012.461
Subtract 78 from 120 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 10:
78 goes into 420 5 times with a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 11012.4615
Deduct 390 from 420 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 11:
78 goes into 300 3 times with a remainder of 66.
The number 3 becomes the next digit in our result. 
Result so far: 11012.46153
Subtract 234 from 300 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 12:
78 can be fit into 660 8 times, resulting in a remainder of 36.
Write down 8 as next digit of the result. 
Result so far: 11012.461538
The remainder is 36 after subtracting 624 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 13:
78 goes into 360 4 times with a remainder of 48.
The next digit of our result is 4. 
Result so far: 11012.4615384
Subtract 312 from 360 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 14:
480 divided by 78 is 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 11012.46153846
If we take 468 away from 480, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 11012.46153846 and a remainder of 1.2e-08.