We divide 689521 by 78
The aim is to understand the frequency of 78 in 689521.

Going ahead to step 1:
6 divided by 78 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 78

Moving on to step 2:
If we divide 68 by 78, we get 0 and a remainder of 68.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 68, we end up with 68.
Bring next digit (9) of the dividend behind the 68 and repeat the process: 689 / 78

Step 3:
78 goes into 689 8 times with a remainder of 65.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 65 after subtracting 624 from 689.
Bring next digit (5) of the dividend behind the 65 and repeat the process: 655 / 78

On to step 4:
If we divide 655 by 78, we get 8 and a remainder of 31.
The next digit of our result is 8. 
Result so far: 88.0
If we take 624 away from 655, we end up with 31.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 78

Step 5:
312 divided by 78 is 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 884.0
Deduct 312 from 312 and we're left with 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 78

Advancing to step 6:
1 divided by 78 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 8840.0
Deduct 0 from 1 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
78 goes into 10 0 times with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 8840.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
If we divide 100 by 78, we get 1 and a remainder of 22.
Put 1 as the next digit of the answer. 
Result so far: 8840.01
If we take 78 away from 100, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 9:
78 goes into 220 2 times with a remainder of 64.
Write down 2 as next digit of the result. 
Result so far: 8840.012
If we take 156 away from 220, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 10:
78 goes into 640 8 times with a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 8840.0128
Subtract 624 from 640 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 11:
The number 78 fits into 160 2 times, leaving a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 8840.01282
If we subtract 156 from 160, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
If we divide 40 by 78, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 8840.01282
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 13:
When dividing 400 by 78, we get 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 8840.0128205
Deduct 390 from 400 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 14:
When dividing 100 by 78, we get 1 with a remainder of 22.
Put 1 as the next digit of the answer. 
Result so far: 8840.01282051
The remainder is 22 after subtracting 78 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The final outcome is 8840.01282051, with a leftover of 2.2e-08.