We're dividing 76757367 by 645 
The aim is to understand the frequency of 645 in 76757367.

Let's proceed to step 1:
If we divide 7 by 645, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (6) of the dividend behind the 7 and repeat the process: 76 / 645

Step 2:
645 can be fit into 76 0 times, resulting in a remainder of 76.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 76 and we're left with 76.
Include the next digit (7) from the dividend after 76, then repeat: 767 / 645

On to step 3:
767 divided by 645 is 1 with a remainder of 122.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 645 from 767, we get 122.
Take the next digit (5) from the dividend and append it to 122, then repeat: 1225 / 645

Step 4:
1225 divided by 645 is 1 with a remainder of 580.
Use 1 as the next digit of our solution. 
Result so far: 11.0
Deduct 645 from 1225 and we're left with 580.
Take the next digit (7) from the dividend and append it to 580, then repeat: 5807 / 645

Let's proceed to step 5:
The number 645 fits into 5807 9 times, leaving a remainder of 2.
The next digit of our result is 9. 
Result so far: 119.0
Subtract 5805 from 5807 to get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 645

Step 6:
When dividing 23 by 645, we get 0 with a remainder of 23.
Put 0 as the next digit of the answer. 
Result so far: 1190.0
Subtracting 0 from 23 leaves us with 23.
Bring next digit (6) of the dividend behind the 23 and repeat the process: 236 / 645

Advancing to step 7:
If we divide 236 by 645, we get 0 and a remainder of 236.
Record the quotient 0 as the next digit in the result. 
Result so far: 11900.0
Deduct 0 from 236 and we're left with 236.
Fetch the next digit (7) from the dividend, attach it to 236 and continue: 2367 / 645

On to step 8:
The number 645 fits into 2367 3 times, leaving a remainder of 432.
Record the quotient 3 as the next digit in the result. 
Result so far: 119003.0
If we subtract 1935 from 2367, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Advancing to step 9:
645 can be fit into 4320 6 times, resulting in a remainder of 450.
Use 6 as the next digit of our solution. 
Result so far: 119003.6
If we take 3870 away from 4320, we end up with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

On to step 10:
The number 645 fits into 4500 6 times, leaving a remainder of 630.
Record the quotient 6 as the next digit in the result. 
Result so far: 119003.66
Deduct 3870 from 4500 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

The final result is 119003.66 with a remainder of 0.63.