We look at the division of 408890 by 78 
The aim is to understand the frequency of 78 in 408890.

Let's proceed to step 1:
If we divide 4 by 78, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 78

Advancing to step 2:
If we divide 40 by 78, we get 0 and a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Take the next digit (8) from the dividend and append it to 40, then repeat: 408 / 78

Advancing to step 3:
408 divided by 78 is 5 with a remainder of 18.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtracting 390 from 408 leaves us with 18.
Fetch the next digit (8) from the dividend, attach it to 18 and continue: 188 / 78

Step 4:
The number 78 fits into 188 2 times, leaving a remainder of 32.
Write down 2 as next digit of the result. 
Result so far: 52.0
If we take 156 away from 188, we end up with 32.
Append the next digit (9) from the dividend to 32 and continue with: 329 / 78

On to step 5:
When dividing 329 by 78, we get 4 with a remainder of 17.
The number 4 becomes the next digit in our result. 
Result so far: 524.0
If we take 312 away from 329, we end up with 17.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 78

Going ahead to step 6:
170 divided by 78 is 2 with a remainder of 14.
The number 2 becomes the next digit in our result. 
Result so far: 5242.0
Deduct 156 from 170 and we're left 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.

Step 7:
140 divided by 78 is 1 with a remainder of 62.
Write down 1 as next digit of the result. 
Result so far: 5242.1
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.

Step 8:
78 goes into 620 7 times with a remainder of 74.
Write down 7 as next digit of the result. 
Result so far: 5242.17
If we subtract 546 from 620, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 9:
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: 5242.179
If we take 702 away from 740, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 10:
When dividing 380 by 78, we get 4 with a remainder of 68.
The next digit of our result is 4. 
Result so far: 5242.1794
Subtract 312 from 380 to get 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:
78 can be fit into 680 8 times, resulting in a remainder of 56.
Use 8 as the next digit of our solution. 
Result so far: 5242.17948
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.

On to step 12:
The number 78 fits into 560 7 times, leaving a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 5242.179487
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:
140 divided by 78 is 1 with a remainder of 62.
Use 1 as the next digit of our solution. 
Result so far: 5242.1794871
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 14:
78 goes into 620 7 times with a remainder of 74.
Put 7 as the next digit of the answer. 
Result so far: 5242.17948717
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.

The final outcome is 5242.17948717, with a leftover of 7.4e-08.