Let's divide 97735582 by 644
The aim is to understand the frequency of 644 in 97735582.

Step 1:
The number 644 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 644

Let's proceed to step 2:
The number 644 fits into 97 0 times, leaving a remainder of 97.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 97 leaves us with 97.
Bring next digit (7) of the dividend behind the 97 and repeat the process: 977 / 644

Advancing to step 3:
977 divided by 644 is 1 with a remainder of 333.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 644 from 977, we get 333.
Fetch the next digit (3) from the dividend, attach it to 333 and continue: 3333 / 644

Advancing to step 4:
644 goes into 3333 5 times with a remainder of 113.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
The remainder is 113 after subtracting 3220 from 3333.
Fetch the next digit (5) from the dividend, attach it to 113 and continue: 1135 / 644

Moving on to step 5:
The number 644 fits into 1135 1 times, leaving a remainder of 491.
Put 1 as the next digit of the answer. 
Result so far: 151.0
Subtracting 644 from 1135 leaves us with 491.
Append the next digit (5) from the dividend to 491 and continue with: 4915 / 644

On to step 6:
If we divide 4915 by 644, we get 7 and a remainder of 407.
Write down 7 as next digit of the result. 
Result so far: 1517.0
If we subtract 4508 from 4915, we get 407.
Grab the next digit (8) from the dividend, add it to 407, then carry on: 4078 / 644

Advancing to step 7:
644 can be fit into 4078 6 times, resulting in a remainder of 214.
The next digit of our result is 6. 
Result so far: 15176.0
Subtracting 3864 from 4078 leaves us with 214.
Grab the next digit (2) from the dividend, add it to 214, then carry on: 2142 / 644

On to step 8:
2142 divided by 644 is 3 with a remainder of 210.
Write down 3 as next digit of the result. 
Result so far: 151763.0
Subtract 1932 from 2142 to get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Step 9:
When dividing 2100 by 644, we get 3 with a remainder of 168.
Write down 3 as next digit of the result. 
Result so far: 151763.3
The remainder is 168 after subtracting 1932 from 2100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Let's proceed to step 10:
1680 divided by 644 is 2 with a remainder of 392.
Record the quotient 2 as the next digit in the result. 
Result so far: 151763.32
Subtract 1288 from 1680 to get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Going ahead to step 11:
If we divide 3920 by 644, we get 6 and a remainder of 56.
The next digit of our result is 6. 
Result so far: 151763.326
If we subtract 3864 from 3920, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 12:
644 can be fit into 560 0 times, resulting in a remainder of 560.
The number 0 becomes the next digit in our result. 
Result so far: 151763.326
Subtracting 0 from 560 leaves us with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Let's proceed to step 13:
644 can be fit into 5600 8 times, resulting in a remainder of 448.
Record the quotient 8 as the next digit in the result. 
Result so far: 151763.32608
Subtract 5152 from 5600 to get 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Going ahead to step 14:
If we divide 4480 by 644, we get 6 and a remainder of 616.
The next digit of our result is 6. 
Result so far: 151763.326086
Deduct 3864 from 4480 and we're left with 616.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6160, and continue the process.

Advancing to step 15:
When dividing 6160 by 644, we get 9 with a remainder of 364.
The number 9 becomes the next digit in our result. 
Result so far: 151763.3260869
If we subtract 5796 from 6160, we get 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Going ahead to step 16:
If we divide 3640 by 644, we get 5 and a remainder of 420.
Put 5 as the next digit of the answer. 
Result so far: 151763.32608695
Subtracting 3220 from 3640 leaves us with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

The final result is 151763.32608695 with a remainder of 4.2e-07.