We're dividing 81373503 by 978 
The aim is to understand the frequency of 978 in 81373503.

Let's proceed to step 1:
When dividing 8 by 978, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 978

Let's proceed to step 2:
978 can be fit into 81 0 times, resulting in a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Take the next digit (3) from the dividend and append it to 81, then repeat: 813 / 978

Moving on to step 3:
The number 978 fits into 813 0 times, leaving a remainder of 813.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 813 to get 813.
Append the next digit (7) from the dividend to 813 and continue with: 8137 / 978

Going ahead to step 4:
The number 978 fits into 8137 8 times, leaving a remainder of 313.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 7824 from 8137 and we're left with 313.
Bring next digit (3) of the dividend behind the 313 and repeat the process: 3133 / 978

Moving on to step 5:
The number 978 fits into 3133 3 times, leaving a remainder of 199.
The next digit of our result is 3. 
Result so far: 83.0
If we subtract 2934 from 3133, we get 199.
Bring next digit (5) of the dividend behind the 199 and repeat the process: 1995 / 978

Step 6:
978 goes into 1995 2 times with a remainder of 39.
Write down 2 as next digit of the result. 
Result so far: 832.0
Subtracting 1956 from 1995 leaves us with 39.
Grab the next digit (0) from the dividend, add it to 39, then carry on: 390 / 978

On to step 7:
390 divided by 978 is 0 with a remainder of 390.
The number 0 becomes the next digit in our result. 
Result so far: 8320.0
Deduct 0 from 390 and we're left with 390.
Fetch the next digit (3) from the dividend, attach it to 390 and continue: 3903 / 978

Moving on to step 8:
978 goes into 3903 3 times with a remainder of 969.
The next digit of our result is 3. 
Result so far: 83203.0
The remainder is 969 after subtracting 2934 from 3903.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9690, and continue the process.

Going ahead to step 9:
978 goes into 9690 9 times with a remainder of 888.
Use 9 as the next digit of our solution. 
Result so far: 83203.9
Subtracting 8802 from 9690 leaves us with 888.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8880, and continue the process.

On to step 10:
The number 978 fits into 8880 9 times, leaving a remainder of 78.
Write down 9 as next digit of the result. 
Result so far: 83203.99
Subtracting 8802 from 8880 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

After the division, we end up with 83203.99 and a remainder of 0.078.