We look at the division of 91440 by 64 
The aim is to understand the frequency of 64 in 91440.

Advancing to step 1:
The number 64 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 64

Moving on to step 2:
The number 64 fits into 91 1 times, leaving a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 27 after subtracting 64 from 91.
Include the next digit (4) from the dividend after 27, then repeat: 274 / 64

Advancing to step 3:
64 can be fit into 274 4 times, resulting in a remainder of 18.
The next digit of our result is 4. 
Result so far: 14.0
Subtracting 256 from 274 leaves us with 18.
Grab the next digit (4) from the dividend, add it to 18, then carry on: 184 / 64

Let's proceed to step 4:
64 goes into 184 2 times with a remainder of 56.
Put 2 as the next digit of the answer. 
Result so far: 142.0
Deduct 128 from 184 and we're left with 56.
Bring next digit (0) of the dividend behind the 56 and repeat the process: 560 / 64

Moving on to step 5:
If we divide 560 by 64, we get 8 and a remainder of 48.
Put 8 as the next digit of the answer. 
Result so far: 1428.0
The remainder is 48 after subtracting 512 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 6:
When dividing 480 by 64, we get 7 with a remainder of 32.
Use 7 as the next digit of our solution. 
Result so far: 1428.7
The remainder is 32 after subtracting 448 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 7:
64 can be fit into 320 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 1428.75
Subtracting 320 from 320 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
The number 64 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1428.75
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
The number 64 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1428.75
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 1428.75, and the remainder is 0.0.