We look at the division of 25821630 by 73 
The aim is to understand the frequency of 73 in 25821630.

Moving on to step 1:
2 divided by 73 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 73

Moving on to step 2:
25 divided by 73 is 0 with a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 25 after subtracting 0 from 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 73

Let's proceed to step 3:
73 can be fit into 258 3 times, resulting in a remainder of 39.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 39 after subtracting 219 from 258.
Fetch the next digit (2) from the dividend, attach it to 39 and continue: 392 / 73

Advancing to step 4:
If we divide 392 by 73, we get 5 and a remainder of 27.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
Subtracting 365 from 392 leaves us with 27.
Include the next digit (1) from the dividend after 27, then repeat: 271 / 73

On to step 5:
73 can be fit into 271 3 times, resulting in a remainder of 52.
Use 3 as the next digit of our solution. 
Result so far: 353.0
If we subtract 219 from 271, we get 52.
Fetch the next digit (6) from the dividend, attach it to 52 and continue: 526 / 73

Step 6:
73 goes into 526 7 times with a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 3537.0
Subtracting 511 from 526 leaves us with 15.
Take the next digit (3) from the dividend and append it to 15, then repeat: 153 / 73

Let's proceed to step 7:
153 divided by 73 is 2 with a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 35372.0
Deduct 146 from 153 and we're left with 7.
Take the next digit (0) from the dividend and append it to 7, then repeat: 70 / 73

Advancing to step 8:
The number 73 fits into 70 0 times, leaving a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 353720.0
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 9:
73 goes into 700 9 times with a remainder of 43.
Use 9 as the next digit of our solution. 
Result so far: 353720.9
Subtract 657 from 700 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 10:
When dividing 430 by 73, we get 5 with a remainder of 65.
The next digit of our result is 5. 
Result so far: 353720.95
If we subtract 365 from 430, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 11:
73 goes into 650 8 times with a remainder of 66.
Put 8 as the next digit of the answer. 
Result so far: 353720.958
The remainder is 66 after subtracting 584 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Moving on to step 12:
73 goes into 660 9 times with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 353720.9589
If we subtract 657 from 660, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
73 goes into 30 0 times with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 353720.9589
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 14:
When dividing 300 by 73, we get 4 with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 353720.958904
Subtract 292 from 300 to 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.

Let's proceed to step 15:
73 can be fit into 80 1 times, resulting in a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 353720.9589041
The remainder is 7 after subtracting 73 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 16:
The number 73 fits into 70 0 times, leaving a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 353720.9589041
If we take 0 away from 70, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 353720.9589041 with a remainder of 7e-08.