690225 divided by 64 
The aim is to understand the frequency of 64 in 690225.

Let's proceed to step 1:
When dividing 6 by 64, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 64

Going ahead to step 2:
69 divided by 64 is 1 with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 64 from 69, we get 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 64

Advancing to step 3:
The number 64 fits into 50 0 times, leaving a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtract 0 from 50 to get 50.
Append the next digit (2) from the dividend to 50 and continue with: 502 / 64

Advancing to step 4:
502 divided by 64 is 7 with a remainder of 54.
The number 7 becomes the next digit in our result. 
Result so far: 107.0
If we subtract 448 from 502, we get 54.
Grab the next digit (2) from the dividend, add it to 54, then carry on: 542 / 64

Let's proceed to step 5:
If we divide 542 by 64, we get 8 and a remainder of 30.
Put 8 as the next digit of the answer. 
Result so far: 1078.0
Deduct 512 from 542 and we're left with 30.
Fetch the next digit (5) from the dividend, attach it to 30 and continue: 305 / 64

Going ahead to step 6:
305 divided by 64 is 4 with a remainder of 49.
The next digit of our result is 4. 
Result so far: 10784.0
Subtract 256 from 305 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 7:
64 goes into 490 7 times with a remainder of 42.
Record the quotient 7 as the next digit in the result. 
Result so far: 10784.7
Subtracting 448 from 490 leaves us 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 8:
420 divided by 64 is 6 with a remainder of 36.
The next digit of our result is 6. 
Result so far: 10784.76
If we take 384 away from 420, we end up 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.

Moving on to step 9:
If we divide 360 by 64, we get 5 and a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 10784.765
Subtract 320 from 360 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 10:
64 goes into 400 6 times with a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 10784.7656
Subtract 384 from 400 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 11:
If we divide 160 by 64, we get 2 and a remainder of 32.
Record the quotient 2 as the next digit in the result. 
Result so far: 10784.76562
Deduct 128 from 160 and we're left 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.

Advancing to step 12:
The number 64 fits into 320 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 10784.765625
Subtract 320 from 320 to 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.

Moving on to step 13:
When dividing 0 by 64, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10784.765625
The remainder is 0 after subtracting 0 from 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 14:
64 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10784.765625
Deduct 0 from 0 and we're left 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.

After the division, we end up with 10784.765625 and a remainder of 0.0.