48960092 divided by 644 
The aim is to understand the frequency of 644 in 48960092.

On to step 1:
When dividing 4 by 644, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 644

Step 2:
644 goes into 48 0 times with a remainder of 48.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 48 and we're left with 48.
Take the next digit (9) from the dividend and append it to 48, then repeat: 489 / 644

Step 3:
644 can be fit into 489 0 times, resulting in a remainder of 489.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 489 to get 489.
Take the next digit (6) from the dividend and append it to 489, then repeat: 4896 / 644

Advancing to step 4:
4896 divided by 644 is 7 with a remainder of 388.
The next digit of our result is 7. 
Result so far: 7.0
Subtracting 4508 from 4896 leaves us with 388.
Append the next digit (0) from the dividend to 388 and continue with: 3880 / 644

Step 5:
The number 644 fits into 3880 6 times, leaving a remainder of 16.
The next digit of our result is 6. 
Result so far: 76.0
Subtracting 3864 from 3880 leaves us with 16.
Append the next digit (0) from the dividend to 16 and continue with: 160 / 644

On to step 6:
644 goes into 160 0 times with a remainder of 160.
The number 0 becomes the next digit in our result. 
Result so far: 760.0
If we take 0 away from 160, we end up with 160.
Fetch the next digit (9) from the dividend, attach it to 160 and continue: 1609 / 644

Going ahead to step 7:
644 goes into 1609 2 times with a remainder of 321.
Put 2 as the next digit of the answer. 
Result so far: 7602.0
If we subtract 1288 from 1609, we get 321.
Fetch the next digit (2) from the dividend, attach it to 321 and continue: 3212 / 644

Step 8:
If we divide 3212 by 644, we get 4 and a remainder of 636.
Use 4 as the next digit of our solution. 
Result so far: 76024.0
Subtracting 2576 from 3212 leaves us with 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Advancing to step 9:
644 can be fit into 6360 9 times, resulting in a remainder of 564.
Put 9 as the next digit of the answer. 
Result so far: 76024.9
If we take 5796 away from 6360, we end up with 564.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5640, and continue the process.

Moving on to step 10:
If we divide 5640 by 644, we get 8 and a remainder of 488.
The number 8 becomes the next digit in our result. 
Result so far: 76024.98
If we subtract 5152 from 5640, we get 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Advancing to step 11:
If we divide 4880 by 644, we get 7 and a remainder of 372.
Record the quotient 7 as the next digit in the result. 
Result so far: 76024.987
If we take 4508 away from 4880, we end up with 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

On to step 12:
644 can be fit into 3720 5 times, resulting in a remainder of 500.
The number 5 becomes the next digit in our result. 
Result so far: 76024.9875
Subtracting 3220 from 3720 leaves us with 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Let's proceed to step 13:
If we divide 5000 by 644, we get 7 and a remainder of 492.
Write down 7 as next digit of the result. 
Result so far: 76024.98757
If we subtract 4508 from 5000, we get 492.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4920, and continue the process.

Advancing to step 14:
644 goes into 4920 7 times with a remainder of 412.
Record the quotient 7 as the next digit in the result. 
Result so far: 76024.987577
Subtracting 4508 from 4920 leaves us with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

The final outcome is 76024.987577, with a leftover of 4.12e-05.