We divide 97040621 by 644
The aim is to understand the frequency of 644 in 97040621.

Moving on to step 1:
9 divided by 644 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 644

On to step 2:
644 goes into 97 0 times with a remainder of 97.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 97 after subtracting 0 from 97.
Bring next digit (0) of the dividend behind the 97 and repeat the process: 970 / 644

Let's proceed to step 3:
644 can be fit into 970 1 times, resulting in a remainder of 326.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 644 away from 970, we end up with 326.
Fetch the next digit (4) from the dividend, attach it to 326 and continue: 3264 / 644

Step 4:
The number 644 fits into 3264 5 times, leaving a remainder of 44.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtract 3220 from 3264 to get 44.
Take the next digit (0) from the dividend and append it to 44, then repeat: 440 / 644

Advancing to step 5:
If we divide 440 by 644, we get 0 and a remainder of 440.
Write down 0 as next digit of the result. 
Result so far: 150.0
Deduct 0 from 440 and we're left with 440.
Include the next digit (6) from the dividend after 440, then repeat: 4406 / 644

Let's proceed to step 6:
If we divide 4406 by 644, we get 6 and a remainder of 542.
The next digit of our result is 6. 
Result so far: 1506.0
If we subtract 3864 from 4406, we get 542.
Grab the next digit (2) from the dividend, add it to 542, then carry on: 5422 / 644

Step 7:
The number 644 fits into 5422 8 times, leaving a remainder of 270.
The number 8 becomes the next digit in our result. 
Result so far: 15068.0
Subtract 5152 from 5422 to get 270.
Include the next digit (1) from the dividend after 270, then repeat: 2701 / 644

Going ahead to step 8:
When dividing 2701 by 644, we get 4 with a remainder of 125.
The number 4 becomes the next digit in our result. 
Result so far: 150684.0
Deduct 2576 from 2701 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Going ahead to step 9:
644 can be fit into 1250 1 times, resulting in a remainder of 606.
Put 1 as the next digit of the answer. 
Result so far: 150684.1
The remainder is 606 after subtracting 644 from 1250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Moving on to step 10:
When dividing 6060 by 644, we get 9 with a remainder of 264.
Write down 9 as next digit of the result. 
Result so far: 150684.19
If we subtract 5796 from 6060, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Moving on to step 11:
644 can be fit into 2640 4 times, resulting in a remainder of 64.
Use 4 as the next digit of our solution. 
Result so far: 150684.194
If we take 2576 away from 2640, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 12:
When dividing 640 by 644, we get 0 with a remainder of 640.
Put 0 as the next digit of the answer. 
Result so far: 150684.194
Deduct 0 from 640 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

On to step 13:
644 goes into 6400 9 times with a remainder of 604.
The number 9 becomes the next digit in our result. 
Result so far: 150684.19409
Subtracting 5796 from 6400 leaves us with 604.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6040, and continue the process.

Advancing to step 14:
If we divide 6040 by 644, we get 9 and a remainder of 244.
The next digit of our result is 9. 
Result so far: 150684.194099
Subtracting 5796 from 6040 leaves us with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

The final result is 150684.194099 with a remainder of 2.44e-05.