We're dividing 644621 by 48 
The aim is to understand the frequency of 48 in 644621.

Advancing to step 1:
The number 48 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 48

Advancing to step 2:
When dividing 64 by 48, we get 1 with a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 48 from 64 and we're left with 16.
Include the next digit (4) from the dividend after 16, then repeat: 164 / 48

Moving on to step 3:
48 can be fit into 164 3 times, resulting in a remainder of 20.
The next digit of our result is 3. 
Result so far: 13.0
Subtracting 144 from 164 leaves us with 20.
Grab the next digit (6) from the dividend, add it to 20, then carry on: 206 / 48

On to step 4:
206 divided by 48 is 4 with a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 134.0
Deduct 192 from 206 and we're left with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 48

Advancing to step 5:
142 divided by 48 is 2 with a remainder of 46.
The next digit of our result is 2. 
Result so far: 1342.0
Subtract 96 from 142 to get 46.
Append the next digit (1) from the dividend to 46 and continue with: 461 / 48

Step 6:
48 can be fit into 461 9 times, resulting in a remainder of 29.
The number 9 becomes the next digit in our result. 
Result so far: 13429.0
If we take 432 away from 461, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 7:
290 divided by 48 is 6 with a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 13429.6
Subtracting 288 from 290 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
If we divide 20 by 48, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 13429.6
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 9:
48 goes into 200 4 times with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 13429.604
If we subtract 192 from 200, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 10:
48 can be fit into 80 1 times, resulting in a remainder of 32.
The next digit of our result is 1. 
Result so far: 13429.6041
Subtract 48 from 80 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 11:
320 divided by 48 is 6 with a remainder of 32.
Write down 6 as next digit of the result. 
Result so far: 13429.60416
Subtract 288 from 320 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 12:
The number 48 fits into 320 6 times, leaving a remainder of 32.
Use 6 as the next digit of our solution. 
Result so far: 13429.604166
Subtracting 288 from 320 leaves us 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.

Our division results in 13429.604166 with a remaining 3.2e-06.