986400 ÷ 54 
The aim is to understand the frequency of 54 in 986400.

Let's proceed to step 1:
When dividing 9 by 54, we get 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 54

Moving on to step 2:
The number 54 fits into 98 1 times, leaving a remainder of 44.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 54 away from 98, we end up with 44.
Fetch the next digit (6) from the dividend, attach it to 44 and continue: 446 / 54

Let's proceed to step 3:
446 divided by 54 is 8 with a remainder of 14.
Put 8 as the next digit of the answer. 
Result so far: 18.0
The remainder is 14 after subtracting 432 from 446.
Include the next digit (4) from the dividend after 14, then repeat: 144 / 54

Going ahead to step 4:
When dividing 144 by 54, we get 2 with a remainder of 36.
The next digit of our result is 2. 
Result so far: 182.0
If we take 108 away from 144, we end up with 36.
Bring next digit (0) of the dividend behind the 36 and repeat the process: 360 / 54

Advancing to step 5:
When dividing 360 by 54, we get 6 with a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 1826.0
If we take 324 away from 360, we end up with 36.
Grab the next digit (0) from the dividend, add it to 36, then carry on: 360 / 54

Moving on to step 6:
The number 54 fits into 360 6 times, leaving a remainder of 36.
The next digit of our result is 6. 
Result so far: 18266.0
If we subtract 324 from 360, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 7:
If we divide 360 by 54, we get 6 and a remainder of 36.
Record the quotient 6 as the next digit in the result. 
Result so far: 18266.6
Subtract 324 from 360 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 8:
If we divide 360 by 54, we get 6 and a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 18266.66
Deduct 324 from 360 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final outcome is 18266.66, with a leftover of 0.036.