We're dividing 21681800 by 73 
The aim is to understand the frequency of 73 in 21681800.

Step 1:
When dividing 2 by 73, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 73

Step 2:
The number 73 fits into 21 0 times, leaving a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 73

Moving on to step 3:
73 goes into 216 2 times with a remainder of 70.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 70 after subtracting 146 from 216.
Append the next digit (8) from the dividend to 70 and continue with: 708 / 73

On to step 4:
73 goes into 708 9 times with a remainder of 51.
Put 9 as the next digit of the answer. 
Result so far: 29.0
Subtracting 657 from 708 leaves us with 51.
Grab the next digit (1) from the dividend, add it to 51, then carry on: 511 / 73

Step 5:
If we divide 511 by 73, we get 7 and a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 297.0
If we subtract 511 from 511, we get 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 73

On to step 6:
The number 73 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 2970.0
Subtract 0 from 8 to get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 73

Moving on to step 7:
If we divide 80 by 73, we get 1 and a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 29701.0
The remainder is 7 after subtracting 73 from 80.
Bring next digit (0) of the dividend behind the 7 and repeat the process: 70 / 73

Step 8:
70 divided by 73 is 0 with a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 297010.0
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.

Step 9:
When dividing 700 by 73, we get 9 with a remainder of 43.
Record the quotient 9 as the next digit in the result. 
Result so far: 297010.9
Subtracting 657 from 700 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 10:
430 divided by 73 is 5 with a remainder of 65.
The next digit of our result is 5. 
Result so far: 297010.95
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.

Let's proceed to step 11:
73 can be fit into 650 8 times, resulting in a remainder of 66.
The next digit of our result is 8. 
Result so far: 297010.958
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.

Going ahead to step 12:
If we divide 660 by 73, we get 9 and a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 297010.9589
Subtracting 657 from 660 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 13:
73 goes into 30 0 times with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 297010.9589
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 14:
73 goes into 300 4 times with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 297010.958904
If we take 292 away from 300, we end up with 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 15:
When dividing 80 by 73, we get 1 with a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 297010.9589041
If we take 73 away from 80, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 16:
The number 73 fits into 70 0 times, leaving a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 297010.9589041
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.

In conclusion, the division gives 297010.9589041 with a balance of 7e-08.