Let's divide 630686 by 78
The aim is to understand the frequency of 78 in 630686.

Step 1:
If we divide 6 by 78, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 78

Step 2:
78 can be fit into 63 0 times, resulting in a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 63 and we're left with 63.
Take the next digit (0) from the dividend and append it to 63, then repeat: 630 / 78

Moving on to step 3:
When dividing 630 by 78, we get 8 with a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 6 after subtracting 624 from 630.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 78

Step 4:
If we divide 66 by 78, we get 0 and a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 80.0
If we subtract 0 from 66, we get 66.
Append the next digit (8) from the dividend to 66 and continue with: 668 / 78

On to step 5:
If we divide 668 by 78, we get 8 and a remainder of 44.
Use 8 as the next digit of our solution. 
Result so far: 808.0
Deduct 624 from 668 and we're left with 44.
Append the next digit (6) from the dividend to 44 and continue with: 446 / 78

Advancing to step 6:
78 can be fit into 446 5 times, resulting in a remainder of 56.
Use 5 as the next digit of our solution. 
Result so far: 8085.0
Subtract 390 from 446 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 7:
78 goes into 560 7 times with a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 8085.7
If we take 546 away from 560, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
78 goes into 140 1 times with a remainder of 62.
Put 1 as the next digit of the answer. 
Result so far: 8085.71
Deduct 78 from 140 and we're left 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.

Let's proceed to step 9:
78 goes into 620 7 times with a remainder of 74.
The number 7 becomes the next digit in our result. 
Result so far: 8085.717
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.

Moving on to step 10:
When dividing 740 by 78, we get 9 with a remainder of 38.
Use 9 as the next digit of our solution. 
Result so far: 8085.7179
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 11:
380 divided by 78 is 4 with a remainder of 68.
Put 4 as the next digit of the answer. 
Result so far: 8085.71794
If we take 312 away from 380, we end up 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 12:
The number 78 fits into 680 8 times, leaving a remainder of 56.
Use 8 as the next digit of our solution. 
Result so far: 8085.717948
Subtract 624 from 680 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 13:
If we divide 560 by 78, we get 7 and a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 8085.7179487
The remainder is 14 after subtracting 546 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 14:
140 divided by 78 is 1 with a remainder of 62.
Use 1 as the next digit of our solution. 
Result so far: 8085.71794871
The remainder is 62 after subtracting 78 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Our division results in 8085.71794871 with a remaining 6.2e-08.