21523125 ÷ 48 
The aim is to understand the frequency of 48 in 21523125.

On to step 1:
The number 48 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 48

Let's proceed to step 2:
48 goes into 21 0 times with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 48

Let's proceed to step 3:
48 goes into 215 4 times with a remainder of 23.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 23 after subtracting 192 from 215.
Bring next digit (2) of the dividend behind the 23 and repeat the process: 232 / 48

On to step 4:
48 goes into 232 4 times with a remainder of 40.
Use 4 as the next digit of our solution. 
Result so far: 44.0
Subtract 192 from 232 to get 40.
Take the next digit (3) from the dividend and append it to 40, then repeat: 403 / 48

Advancing to step 5:
403 divided by 48 is 8 with a remainder of 19.
Write down 8 as next digit of the result. 
Result so far: 448.0
Subtracting 384 from 403 leaves us with 19.
Append the next digit (1) from the dividend to 19 and continue with: 191 / 48

Moving on to step 6:
191 divided by 48 is 3 with a remainder of 47.
The next digit of our result is 3. 
Result so far: 4483.0
If we take 144 away from 191, we end up with 47.
Grab the next digit (2) from the dividend, add it to 47, then carry on: 472 / 48

On to step 7:
48 can be fit into 472 9 times, resulting in a remainder of 40.
The number 9 becomes the next digit in our result. 
Result so far: 44839.0
If we take 432 away from 472, we end up with 40.
Take the next digit (5) from the dividend and append it to 40, then repeat: 405 / 48

Moving on to step 8:
If we divide 405 by 48, we get 8 and a remainder of 21.
The number 8 becomes the next digit in our result. 
Result so far: 448398.0
If we subtract 384 from 405, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 9:
If we divide 210 by 48, we get 4 and a remainder of 18.
Use 4 as the next digit of our solution. 
Result so far: 448398.4
Deduct 192 from 210 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 10:
48 goes into 180 3 times with a remainder of 36.
Write down 3 as next digit of the result. 
Result so far: 448398.43
The remainder is 36 after subtracting 144 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 11:
48 can be fit into 360 7 times, resulting in a remainder of 24.
The next digit of our result is 7. 
Result so far: 448398.437
Deduct 336 from 360 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 12:
48 goes into 240 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 448398.4375
Deduct 240 from 240 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 13:
The number 48 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 448398.4375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 14:
If we divide 0 by 48, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 448398.4375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 448398.4375 and a remainder of 0.0.