643290 ÷ 54 
The aim is to understand the frequency of 54 in 643290.

On to step 1:
The number 54 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 54

Advancing to step 2:
54 can be fit into 64 1 times, resulting in a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 54 from 64 to get 10.
Grab the next digit (3) from the dividend, add it to 10, then carry on: 103 / 54

On to step 3:
When dividing 103 by 54, we get 1 with a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 11.0
Subtracting 54 from 103 leaves us with 49.
Grab the next digit (2) from the dividend, add it to 49, then carry on: 492 / 54

Let's proceed to step 4:
492 divided by 54 is 9 with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 119.0
The remainder is 6 after subtracting 486 from 492.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 54

On to step 5:
When dividing 69 by 54, we get 1 with a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 1191.0
If we subtract 54 from 69, we get 15.
Take the next digit (0) from the dividend and append it to 15, then repeat: 150 / 54

Going ahead to step 6:
The number 54 fits into 150 2 times, leaving a remainder of 42.
Write down 2 as next digit of the result. 
Result so far: 11912.0
If we take 108 away from 150, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 7:
The number 54 fits into 420 7 times, leaving a remainder of 42.
Put 7 as the next digit of the answer. 
Result so far: 11912.7
The remainder is 42 after subtracting 378 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 8:
54 goes into 420 7 times with a remainder of 42.
The number 7 becomes the next digit in our result. 
Result so far: 11912.77
If we subtract 378 from 420, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The quotient of the division is 11912.77, and the remainder is 0.042.