We look at the division of 444521 by 73 
The aim is to understand the frequency of 73 in 444521.

Let's proceed to step 1:
The number 73 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (4) from the dividend to 4 and continue with: 44 / 73

Advancing to step 2:
When dividing 44 by 73, we get 0 with a remainder of 44.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 44 leaves us with 44.
Include the next digit (4) from the dividend after 44, then repeat: 444 / 73

Advancing to step 3:
When dividing 444 by 73, we get 6 with a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 6 after subtracting 438 from 444.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 73

Moving on to step 4:
If we divide 65 by 73, we get 0 and a remainder of 65.
The next digit of our result is 0. 
Result so far: 60.0
Subtracting 0 from 65 leaves us with 65.
Take the next digit (2) from the dividend and append it to 65, then repeat: 652 / 73

Advancing to step 5:
When dividing 652 by 73, we get 8 with a remainder of 68.
Record the quotient 8 as the next digit in the result. 
Result so far: 608.0
If we take 584 away from 652, we end up with 68.
Append the next digit (1) from the dividend to 68 and continue with: 681 / 73

Step 6:
73 goes into 681 9 times with a remainder of 24.
Put 9 as the next digit of the answer. 
Result so far: 6089.0
If we take 657 away from 681, we end up 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.

On to step 7:
The number 73 fits into 240 3 times, leaving a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 6089.3
Deduct 219 from 240 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 8:
73 goes into 210 2 times with a remainder of 64.
Write down 2 as next digit of the result. 
Result so far: 6089.32
If we subtract 146 from 210, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 9:
73 goes into 640 8 times with a remainder of 56.
Write down 8 as next digit of the result. 
Result so far: 6089.328
Subtracting 584 from 640 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 10:
If we divide 560 by 73, we get 7 and a remainder of 49.
Use 7 as the next digit of our solution. 
Result so far: 6089.3287
Subtracting 511 from 560 leaves us with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 11:
If we divide 490 by 73, we get 6 and a remainder of 52.
Write down 6 as next digit of the result. 
Result so far: 6089.32876
If we subtract 438 from 490, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 12:
If we divide 520 by 73, we get 7 and a remainder of 9.
Use 7 as the next digit of our solution. 
Result so far: 6089.328767
Deduct 511 from 520 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 13:
73 can be fit into 90 1 times, resulting in a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 6089.3287671
If we subtract 73 from 90, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 14:
170 divided by 73 is 2 with a remainder of 24.
The next digit of our result is 2. 
Result so far: 6089.32876712
Subtract 146 from 170 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

After the division, we end up with 6089.32876712 and a remainder of 2.4e-08.