We look at the division of 121603 by 73 
The aim is to understand the frequency of 73 in 121603.

Going ahead to step 1:
73 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 73

Let's proceed to step 2:
73 can be fit into 12 0 times, resulting in a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 73

Going ahead to step 3:
73 goes into 121 1 times with a remainder of 48.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 73 from 121 and we're left with 48.
Take the next digit (6) from the dividend and append it to 48, then repeat: 486 / 73

Moving on to step 4:
When dividing 486 by 73, we get 6 with a remainder of 48.
The next digit of our result is 6. 
Result so far: 16.0
If we subtract 438 from 486, we get 48.
Bring next digit (0) of the dividend behind the 48 and repeat the process: 480 / 73

Let's proceed to step 5:
When dividing 480 by 73, we get 6 with a remainder of 42.
The number 6 becomes the next digit in our result. 
Result so far: 166.0
The remainder is 42 after subtracting 438 from 480.
Append the next digit (3) from the dividend to 42 and continue with: 423 / 73

Step 6:
The number 73 fits into 423 5 times, leaving a remainder of 58.
The next digit of our result is 5. 
Result so far: 1665.0
If we take 365 away from 423, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 7:
When dividing 580 by 73, we get 7 with a remainder of 69.
Use 7 as the next digit of our solution. 
Result so far: 1665.7
If we take 511 away from 580, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 8:
73 goes into 690 9 times with a remainder of 33.
The next digit of our result is 9. 
Result so far: 1665.79
If we subtract 657 from 690, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 9:
73 can be fit into 330 4 times, resulting in a remainder of 38.
Use 4 as the next digit of our solution. 
Result so far: 1665.794
Subtract 292 from 330 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 10:
73 can be fit into 380 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 1665.7945
If we take 365 away from 380, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 11:
73 can be fit into 150 2 times, resulting in a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 1665.79452
Subtract 146 from 150 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 12:
73 can be fit into 40 0 times, resulting in a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 1665.79452
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 13:
The number 73 fits into 400 5 times, leaving a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 1665.7945205
If we subtract 365 from 400, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 14:
73 goes into 350 4 times with a remainder of 58.
The number 4 becomes the next digit in our result. 
Result so far: 1665.79452054
If we take 292 away from 350, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Our division results in 1665.79452054 with a remaining 5.8e-08.