We look at the division of 55955615 by 987 
The aim is to understand the frequency of 987 in 55955615.

On to step 1:
When dividing 5 by 987, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 987

Advancing to step 2:
987 goes into 55 0 times with a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Bring next digit (9) of the dividend behind the 55 and repeat the process: 559 / 987

Going ahead to step 3:
987 can be fit into 559 0 times, resulting in a remainder of 559.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 559 and we're left with 559.
Include the next digit (5) from the dividend after 559, then repeat: 5595 / 987

Going ahead to step 4:
5595 divided by 987 is 5 with a remainder of 660.
The next digit of our result is 5. 
Result so far: 5.0
If we subtract 4935 from 5595, we get 660.
Fetch the next digit (5) from the dividend, attach it to 660 and continue: 6605 / 987

On to step 5:
987 can be fit into 6605 6 times, resulting in a remainder of 683.
Record the quotient 6 as the next digit in the result. 
Result so far: 56.0
If we take 5922 away from 6605, we end up with 683.
Grab the next digit (6) from the dividend, add it to 683, then carry on: 6836 / 987

Moving on to step 6:
The number 987 fits into 6836 6 times, leaving a remainder of 914.
Record the quotient 6 as the next digit in the result. 
Result so far: 566.0
If we take 5922 away from 6836, we end up with 914.
Fetch the next digit (1) from the dividend, attach it to 914 and continue: 9141 / 987

On to step 7:
987 goes into 9141 9 times with a remainder of 258.
The number 9 becomes the next digit in our result. 
Result so far: 5669.0
If we subtract 8883 from 9141, we get 258.
Append the next digit (5) from the dividend to 258 and continue with: 2585 / 987

Advancing to step 8:
When dividing 2585 by 987, we get 2 with a remainder of 611.
Record the quotient 2 as the next digit in the result. 
Result so far: 56692.0
Deduct 1974 from 2585 and we're left with 611.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6110, and continue the process.

Moving on to step 9:
When dividing 6110 by 987, we get 6 with a remainder of 188.
Use 6 as the next digit of our solution. 
Result so far: 56692.6
Deduct 5922 from 6110 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 10:
When dividing 1880 by 987, we get 1 with a remainder of 893.
The next digit of our result is 1. 
Result so far: 56692.61
If we take 987 away from 1880, we end up with 893.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8930, and continue the process.

Step 11:
If we divide 8930 by 987, we get 9 and a remainder of 47.
Use 9 as the next digit of our solution. 
Result so far: 56692.619
If we subtract 8883 from 8930, we get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 12:
If we divide 470 by 987, we get 0 and a remainder of 470.
Record the quotient 0 as the next digit in the result. 
Result so far: 56692.619
Deduct 0 from 470 and we're left with 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Going ahead to step 13:
If we divide 4700 by 987, we get 4 and a remainder of 752.
Put 4 as the next digit of the answer. 
Result so far: 56692.61904
Subtract 3948 from 4700 to get 752.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7520, and continue the process.

Step 14:
When dividing 7520 by 987, we get 7 with a remainder of 611.
Record the quotient 7 as the next digit in the result. 
Result so far: 56692.619047
Deduct 6909 from 7520 and we're left with 611.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6110, and continue the process.

Step 15:
When dividing 6110 by 987, we get 6 with a remainder of 188.
The next digit of our result is 6. 
Result so far: 56692.6190476
The remainder is 188 after subtracting 5922 from 6110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Going ahead to step 16:
987 goes into 1880 1 times with a remainder of 893.
Record the quotient 1 as the next digit in the result. 
Result so far: 56692.61904761
Subtracting 987 from 1880 leaves us with 893.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8930, and continue the process.

The final outcome is 56692.61904761, with a leftover of 8.93e-07.