87983578 divided by 966 
The aim is to understand the frequency of 966 in 87983578.

Let's proceed to step 1:
If we divide 8 by 966, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 966

Let's proceed to step 2:
87 divided by 966 is 0 with a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 87 to get 87.
Take the next digit (9) from the dividend and append it to 87, then repeat: 879 / 966

On to step 3:
When dividing 879 by 966, we get 0 with a remainder of 879.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 879 leaves us with 879.
Append the next digit (8) from the dividend to 879 and continue with: 8798 / 966

Going ahead to step 4:
8798 divided by 966 is 9 with a remainder of 104.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 8694 from 8798 and we're left with 104.
Take the next digit (3) from the dividend and append it to 104, then repeat: 1043 / 966

Let's proceed to step 5:
1043 divided by 966 is 1 with a remainder of 77.
The next digit of our result is 1. 
Result so far: 91.0
If we take 966 away from 1043, we end up with 77.
Take the next digit (5) from the dividend and append it to 77, then repeat: 775 / 966

Advancing to step 6:
If we divide 775 by 966, we get 0 and a remainder of 775.
Record the quotient 0 as the next digit in the result. 
Result so far: 910.0
Deduct 0 from 775 and we're left with 775.
Grab the next digit (7) from the dividend, add it to 775, then carry on: 7757 / 966

Step 7:
966 can be fit into 7757 8 times, resulting in a remainder of 29.
The number 8 becomes the next digit in our result. 
Result so far: 9108.0
Deduct 7728 from 7757 and we're left with 29.
Take the next digit (8) from the dividend and append it to 29, then repeat: 298 / 966

Moving on to step 8:
966 goes into 298 0 times with a remainder of 298.
Write down 0 as next digit of the result. 
Result so far: 91080.0
If we subtract 0 from 298, we get 298.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Advancing to step 9:
966 can be fit into 2980 3 times, resulting in a remainder of 82.
Use 3 as the next digit of our solution. 
Result so far: 91080.3
The remainder is 82 after subtracting 2898 from 2980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 10:
966 can be fit into 820 0 times, resulting in a remainder of 820.
The next digit of our result is 0. 
Result so far: 91080.3
Deduct 0 from 820 and we're left with 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8200, and continue the process.

Going ahead to step 11:
966 can be fit into 8200 8 times, resulting in a remainder of 472.
The number 8 becomes the next digit in our result. 
Result so far: 91080.308
Subtracting 7728 from 8200 leaves us with 472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4720, and continue the process.

Advancing to step 12:
The number 966 fits into 4720 4 times, leaving a remainder of 856.
Record the quotient 4 as the next digit in the result. 
Result so far: 91080.3084
The remainder is 856 after subtracting 3864 from 4720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8560, and continue the process.

Going ahead to step 13:
When dividing 8560 by 966, we get 8 with a remainder of 832.
Put 8 as the next digit of the answer. 
Result so far: 91080.30848
If we subtract 7728 from 8560, we get 832.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8320, and continue the process.

Going ahead to step 14:
When dividing 8320 by 966, we get 8 with a remainder of 592.
Use 8 as the next digit of our solution. 
Result so far: 91080.308488
If we subtract 7728 from 8320, we get 592.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

The final outcome is 91080.308488, with a leftover of 5.92e-05.