We're dividing 20875661 by 978 
The aim is to understand the frequency of 978 in 20875661.

Advancing to step 1:
When dividing 2 by 978, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 978

Step 2:
20 divided by 978 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 978

Going ahead to step 3:
When dividing 208 by 978, we get 0 with a remainder of 208.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 208, we get 208.
Bring next digit (7) of the dividend behind the 208 and repeat the process: 2087 / 978

On to step 4:
978 can be fit into 2087 2 times, resulting in a remainder of 131.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 1956 from 2087 to get 131.
Grab the next digit (5) from the dividend, add it to 131, then carry on: 1315 / 978

Advancing to step 5:
978 can be fit into 1315 1 times, resulting in a remainder of 337.
Write down 1 as next digit of the result. 
Result so far: 21.0
Deduct 978 from 1315 and we're left with 337.
Append the next digit (6) from the dividend to 337 and continue with: 3376 / 978

Advancing to step 6:
978 can be fit into 3376 3 times, resulting in a remainder of 442.
The number 3 becomes the next digit in our result. 
Result so far: 213.0
The remainder is 442 after subtracting 2934 from 3376.
Take the next digit (6) from the dividend and append it to 442, then repeat: 4426 / 978

Going ahead to step 7:
978 goes into 4426 4 times with a remainder of 514.
Put 4 as the next digit of the answer. 
Result so far: 2134.0
If we subtract 3912 from 4426, we get 514.
Include the next digit (1) from the dividend after 514, then repeat: 5141 / 978

Let's proceed to step 8:
5141 divided by 978 is 5 with a remainder of 251.
Write down 5 as next digit of the result. 
Result so far: 21345.0
Deduct 4890 from 5141 and we're left with 251.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

On to step 9:
2510 divided by 978 is 2 with a remainder of 554.
Record the quotient 2 as the next digit in the result. 
Result so far: 21345.2
The remainder is 554 after subtracting 1956 from 2510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

On to step 10:
978 can be fit into 5540 5 times, resulting in a remainder of 650.
The number 5 becomes the next digit in our result. 
Result so far: 21345.25
Subtracting 4890 from 5540 leaves us with 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6500, and continue the process.

Moving on to step 11:
978 can be fit into 6500 6 times, resulting in a remainder of 632.
Write down 6 as next digit of the result. 
Result so far: 21345.256
Subtract 5868 from 6500 to get 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Let's proceed to step 12:
978 goes into 6320 6 times with a remainder of 452.
Write down 6 as next digit of the result. 
Result so far: 21345.2566
If we take 5868 away from 6320, we end up with 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

After the division, we end up with 21345.2566 and a remainder of 0.00452.