8981645 ÷ 64 
The aim is to understand the frequency of 64 in 8981645.

Step 1:
8 divided by 64 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 64

Let's proceed to step 2:
89 divided by 64 is 1 with a remainder of 25.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 64 away from 89, we end up with 25.
Take the next digit (8) from the dividend and append it to 25, then repeat: 258 / 64

Step 3:
The number 64 fits into 258 4 times, leaving a remainder of 2.
The next digit of our result is 4. 
Result so far: 14.0
Subtract 256 from 258 to get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 64

Moving on to step 4:
64 goes into 21 0 times with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 140.0
Deduct 0 from 21 and we're left with 21.
Bring next digit (6) of the dividend behind the 21 and repeat the process: 216 / 64

Moving on to step 5:
64 can be fit into 216 3 times, resulting in a remainder of 24.
Use 3 as the next digit of our solution. 
Result so far: 1403.0
The remainder is 24 after subtracting 192 from 216.
Bring next digit (4) of the dividend behind the 24 and repeat the process: 244 / 64

Step 6:
244 divided by 64 is 3 with a remainder of 52.
Put 3 as the next digit of the answer. 
Result so far: 14033.0
Subtract 192 from 244 to get 52.
Fetch the next digit (5) from the dividend, attach it to 52 and continue: 525 / 64

On to step 7:
525 divided by 64 is 8 with a remainder of 13.
Write down 8 as next digit of the result. 
Result so far: 140338.0
Deduct 512 from 525 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 8:
If we divide 130 by 64, we get 2 and a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 140338.2
Deduct 128 from 130 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 9:
64 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 140338.2
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
200 divided by 64 is 3 with a remainder of 8.
Use 3 as the next digit of our solution. 
Result so far: 140338.203
If we subtract 192 from 200, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
64 can be fit into 80 1 times, resulting in a remainder of 16.
Record the quotient 1 as the next digit in the result. 
Result so far: 140338.2031
Subtracting 64 from 80 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 12:
The number 64 fits into 160 2 times, leaving a remainder of 32.
Use 2 as the next digit of our solution. 
Result so far: 140338.20312
If we take 128 away from 160, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 13:
If we divide 320 by 64, we get 5 and a remainder of 0.
The next digit of our result is 5. 
Result so far: 140338.203125
If we subtract 320 from 320, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 14:
0 divided by 64 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 140338.203125
Subtracting 0 from 0 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.

On to step 15:
64 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 140338.203125
If we subtract 0 from 0, we get 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 final result is 140338.203125 with a remainder of 0.0.