Let's divide 641186 by 78
The aim is to understand the frequency of 78 in 641186.

Going ahead to step 1:
If we divide 6 by 78, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 78

On to step 2:
78 goes into 64 0 times with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Bring next digit (1) of the dividend behind the 64 and repeat the process: 641 / 78

Step 3:
The number 78 fits into 641 8 times, leaving a remainder of 17.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtract 624 from 641 to get 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 78

Let's proceed to step 4:
The number 78 fits into 171 2 times, leaving a remainder of 15.
Write down 2 as next digit of the result. 
Result so far: 82.0
The remainder is 15 after subtracting 156 from 171.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 78

On to step 5:
78 can be fit into 158 2 times, resulting in a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 822.0
If we subtract 156 from 158, we get 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 78

Advancing to step 6:
If we divide 26 by 78, we get 0 and a remainder of 26.
The next digit of our result is 0. 
Result so far: 8220.0
Deduct 0 from 26 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 7:
When dividing 260 by 78, we get 3 with a remainder of 26.
Use 3 as the next digit of our solution. 
Result so far: 8220.3
Deduct 234 from 260 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 8:
78 can be fit into 260 3 times, resulting in a remainder of 26.
The number 3 becomes the next digit in our result. 
Result so far: 8220.33
If we subtract 234 from 260, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Our division results in 8220.33 with a remaining 0.026.