671643 ÷ 73 
The aim is to understand the frequency of 73 in 671643.

On to step 1:
When dividing 6 by 73, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (7) from the dividend, attach it to 6 and continue: 67 / 73

Moving on to step 2:
73 goes into 67 0 times with a remainder of 67.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 67 and we're left with 67.
Take the next digit (1) from the dividend and append it to 67, then repeat: 671 / 73

Step 3:
The number 73 fits into 671 9 times, leaving a remainder of 14.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Deduct 657 from 671 and we're left with 14.
Grab the next digit (6) from the dividend, add it to 14, then carry on: 146 / 73

Let's proceed to step 4:
When dividing 146 by 73, we get 2 with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 92.0
Subtracting 146 from 146 leaves us with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 73

Step 5:
73 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 920.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 73

Let's proceed to step 6:
73 can be fit into 43 0 times, resulting in a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 9200.0
If we take 0 away from 43, we end up 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.

Moving on to step 7:
If we divide 430 by 73, we get 5 and a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 9200.5
Subtract 365 from 430 to 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.

Moving on to step 8:
If we divide 650 by 73, we get 8 and a remainder of 66.
The number 8 becomes the next digit in our result. 
Result so far: 9200.58
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.

On to step 9:
When dividing 660 by 73, we get 9 with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 9200.589
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.

Advancing to step 10:
30 divided by 73 is 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 9200.589
If we take 0 away from 30, we end up 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 11:
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: 9200.58904
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.

On to step 12:
The number 73 fits into 80 1 times, leaving a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 9200.589041
Subtracting 73 from 80 leaves us 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.

Moving on to step 13:
73 can be fit into 70 0 times, resulting in a remainder of 70.
The next digit of our result is 0. 
Result so far: 9200.589041
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.

Step 14:
73 can be fit into 700 9 times, resulting in a remainder of 43.
Record the quotient 9 as the next digit in the result. 
Result so far: 9200.58904109
The remainder is 43 after subtracting 657 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

After the division, we end up with 9200.58904109 and a remainder of 4.3e-08.