We divide 78978556 by 661
The aim is to understand the frequency of 661 in 78978556.

Moving on to step 1:
661 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 661

On to step 2:
661 goes into 78 0 times with a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Take the next digit (9) from the dividend and append it to 78, then repeat: 789 / 661

On to step 3:
661 goes into 789 1 times with a remainder of 128.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 128 after subtracting 661 from 789.
Bring next digit (7) of the dividend behind the 128 and repeat the process: 1287 / 661

Step 4:
1287 divided by 661 is 1 with a remainder of 626.
Use 1 as the next digit of our solution. 
Result so far: 11.0
If we take 661 away from 1287, we end up with 626.
Include the next digit (8) from the dividend after 626, then repeat: 6268 / 661

Let's proceed to step 5:
661 can be fit into 6268 9 times, resulting in a remainder of 319.
Write down 9 as next digit of the result. 
Result so far: 119.0
Subtract 5949 from 6268 to get 319.
Append the next digit (5) from the dividend to 319 and continue with: 3195 / 661

Moving on to step 6:
3195 divided by 661 is 4 with a remainder of 551.
Use 4 as the next digit of our solution. 
Result so far: 1194.0
The remainder is 551 after subtracting 2644 from 3195.
Take the next digit (5) from the dividend and append it to 551, then repeat: 5515 / 661

Let's proceed to step 7:
5515 divided by 661 is 8 with a remainder of 227.
The next digit of our result is 8. 
Result so far: 11948.0
If we take 5288 away from 5515, we end up with 227.
Fetch the next digit (6) from the dividend, attach it to 227 and continue: 2276 / 661

Advancing to step 8:
661 goes into 2276 3 times with a remainder of 293.
Write down 3 as next digit of the result. 
Result so far: 119483.0
Subtract 1983 from 2276 to get 293.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

Moving on to step 9:
The number 661 fits into 2930 4 times, leaving a remainder of 286.
The next digit of our result is 4. 
Result so far: 119483.4
Subtract 2644 from 2930 to get 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Going ahead to step 10:
2860 divided by 661 is 4 with a remainder of 216.
Record the quotient 4 as the next digit in the result. 
Result so far: 119483.44
If we subtract 2644 from 2860, we get 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

The final outcome is 119483.44, with a leftover of 0.216.