We look at the division of 73017435 by 423 
The aim is to understand the frequency of 423 in 73017435.

Advancing to step 1:
423 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 423

Moving on to step 2:
When dividing 73 by 423, we get 0 with a remainder of 73.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 73 leaves us with 73.
Take the next digit (0) from the dividend and append it to 73, then repeat: 730 / 423

Advancing to step 3:
423 goes into 730 1 times with a remainder of 307.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 423 from 730 to get 307.
Include the next digit (1) from the dividend after 307, then repeat: 3071 / 423

On to step 4:
When dividing 3071 by 423, we get 7 with a remainder of 110.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Subtracting 2961 from 3071 leaves us with 110.
Grab the next digit (7) from the dividend, add it to 110, then carry on: 1107 / 423

Going ahead to step 5:
1107 divided by 423 is 2 with a remainder of 261.
Write down 2 as next digit of the result. 
Result so far: 172.0
Deduct 846 from 1107 and we're left with 261.
Grab the next digit (4) from the dividend, add it to 261, then carry on: 2614 / 423

Step 6:
If we divide 2614 by 423, we get 6 and a remainder of 76.
Use 6 as the next digit of our solution. 
Result so far: 1726.0
Subtract 2538 from 2614 to get 76.
Append the next digit (3) from the dividend to 76 and continue with: 763 / 423

Going ahead to step 7:
The number 423 fits into 763 1 times, leaving a remainder of 340.
Use 1 as the next digit of our solution. 
Result so far: 17261.0
Subtracting 423 from 763 leaves us with 340.
Append the next digit (5) from the dividend to 340 and continue with: 3405 / 423

Moving on to step 8:
When dividing 3405 by 423, we get 8 with a remainder of 21.
The next digit of our result is 8. 
Result so far: 172618.0
Subtract 3384 from 3405 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 9:
The number 423 fits into 210 0 times, leaving a remainder of 210.
Use 0 as the next digit of our solution. 
Result so far: 172618.0
Deduct 0 from 210 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Step 10:
423 goes into 2100 4 times with a remainder of 408.
The number 4 becomes the next digit in our result. 
Result so far: 172618.04
Subtracting 1692 from 2100 leaves us with 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

Moving on to step 11:
If we divide 4080 by 423, we get 9 and a remainder of 273.
Record the quotient 9 as the next digit in the result. 
Result so far: 172618.049
If we take 3807 away from 4080, we end up with 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

On to step 12:
423 goes into 2730 6 times with a remainder of 192.
Use 6 as the next digit of our solution. 
Result so far: 172618.0496
Subtract 2538 from 2730 to get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Advancing to step 13:
423 goes into 1920 4 times with a remainder of 228.
Put 4 as the next digit of the answer. 
Result so far: 172618.04964
Subtract 1692 from 1920 to get 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Let's proceed to step 14:
If we divide 2280 by 423, we get 5 and a remainder of 165.
Write down 5 as next digit of the result. 
Result so far: 172618.049645
The remainder is 165 after subtracting 2115 from 2280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Let's proceed to step 15:
423 can be fit into 1650 3 times, resulting in a remainder of 381.
Use 3 as the next digit of our solution. 
Result so far: 172618.0496453
Subtracting 1269 from 1650 leaves us with 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Moving on to step 16:
The number 423 fits into 3810 9 times, leaving a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 172618.04964539
Deduct 3807 from 3810 and we're left 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.

The quotient of the division is 172618.04964539, and the remainder is 3e-09.